# NASA's EVE Mission and the Mystery of the Radius Valley

An episode of [Bedtime Astronomy](https://invisiblenetwork.ai/podcast/1736397134), 3 Aug 2026, 52 min.

Audio: https://dts.podtrac.com/redirect.mp3/api.spreaker.com/download/episode/72911549/a6029666_7429_42c0_8596_3758f97ff552.mp3

Why are so few exoplanets about 1.8 times the size of Earth? This episode explores NASA's proposed Early eVolution Explorer (EVE) mission, designed to investigate the mysterious "radius valley" that separates rocky super-Earths from gas-rich sub-Neptunes. By studying young star clusters and newly formed planets, EVE aims to reveal whether these worlds are born different or transformed over time, offering new insights into how planetary systems evolve. Thank you for listening to Bedtime Astronomy — your guide to the cosmos. New episodes on space exploration, NASA missions & the latest astronomy breakthroughs. This episode includes AI-generated content.

## Transcript

[0:03] Speaker 1: Welcome to Bedtime Astronomy. Explore the wonders of the cosmos
[0:07] Speaker 1: with our soothing Bedtime Astronomie podcast. Each episode offers a
[0:12] Speaker 1: gentle journey through the stars, planets, and beyond, perfect for
[0:16] Speaker 1: unwinding after a long day. Let's travel through the mysteries
[0:20] Speaker 1: of the universe as you drift off into a peaceful
[0:22] Speaker 1: slumber under the night sky.
[0:27] Speaker 2: So if I handed you a master catalog of say,
[0:30] Speaker 2: six thousand newly discovered alien worlds, you would naturally expect
[0:34] Speaker 2: to see planets of pretty much every conceivable size, right.
[0:37] Speaker 3: Yeah, exactly. I mean it just makes intuitive statistical sense.
[0:40] Speaker 2: Right, We're sort of wired to expect this cosmic bell curve.
[0:44] Speaker 2: You'd assume there'd be a few tiny planets, you know,
[0:47] Speaker 2: the size of Mercury, and then this absolute mountain of
[0:50] Speaker 2: average mid sized planets right in the middle of the graph.
[0:54] Speaker 3: And then of course it's trailing off of massive gas
[0:56] Speaker 3: giants like Jupiter at the far end.
[0:59] Speaker 2: Exactly. But when astronomers actually plotted out the real world
[1:03] Speaker 2: measurements of all these exoplanets that humanity has discovered over
[1:06] Speaker 2: the last few decades, they didn't find a smooth, elegant
[1:10] Speaker 2: bell curve at all.
[1:11] Speaker 3: Oh not even close.
[1:12] Speaker 2: They found a ghost town, like impossibly massive, glaringly empty
[1:17] Speaker 2: gap right in the middle of the data, where planets
[1:20] Speaker 2: that are exactly one point eight times the size of
[1:22] Speaker 2: Earth simply do not exist, right.
[1:24] Speaker 3: And today we were really getting into the invisible cosmic
[1:28] Speaker 3: hand that is essentially actively erasing these.
[1:31] Speaker 2: Worlds because the statistical impossibility of that gap, I mean,
[1:35] Speaker 2: it really cannot be overstated.
[1:36] Speaker 3: Oh absolutely not. When you look at the raw data,
[1:39] Speaker 3: you see this massive population of planets peaking around one
[1:43] Speaker 3: point three to one point five times the radius of Earth. Okay,
[1:47] Speaker 3: and then there's another distinct, just massive population peaking around
[1:51] Speaker 3: two point four to two point eight Earth RADI.
[1:53] Speaker 2: But right at that one point eight mark, the.
[1:55] Speaker 3: Distribution just plummets. We call it the radius valley. The
[1:58] Speaker 3: radius valley, Yeah, imodal distribution. This really stark division of
[2:03] Speaker 3: the cosmos into two very specific planetary sizes is I mean,
[2:09] Speaker 3: arguably the greatest unresolved mystery in modern planetary science.
[2:13] Speaker 2: And I want to make sure you the listener, understand
[2:15] Speaker 2: exactly what is at stake here. This isn't just a
[2:17] Speaker 2: conversation about obscure astronomical bookkeeping you know, Nifflin nine, We're
[2:22] Speaker 2: not just categorizing space rocks for the sake of a spreadsheet.
[2:25] Speaker 2: We are talking about deciphering the fundamental underlying thermodynamic and
[2:30] Speaker 2: gravitational laws that govern planetary destiny.
[2:33] Speaker 3: Because whatever violent mechanism is forcing these planets into these
[2:37] Speaker 3: two separate camps, it ultimately dictates whether a solar system
[2:42] Speaker 3: is even capable of producing a habitable world.
[2:45] Speaker 2: Right, if we don't understand the physics carving out this valley,
[2:49] Speaker 2: our entire understanding of the galactic real estate market is flawed.
[2:52] Speaker 3: It completely changes how anomalous our own Earth might be.
[2:56] Speaker 3: It forces us to ask, well, are the planets we
[2:59] Speaker 3: see today the same planets that were born billions of
[3:01] Speaker 3: years ago?
[3:02] Speaker 2: Because we're just looking at an end state.
[3:04] Speaker 3: Exactly the radius valley tells us that either the universe
[3:07] Speaker 3: physically cannot manufacture planets at that one point eight size
[3:11] Speaker 3: due to some limitation in the building materials, or the
[3:15] Speaker 3: universe does manufacture them, but some aggressive evolutionary force systematically
[3:20] Speaker 3: destroys or radically alters them over time.
[3:23] Speaker 2: So we're dealing with a literal cosmic sorting mechanism. Below
[3:27] Speaker 2: the valley, we have the super earths, and above the
[3:29] Speaker 2: valley we have the sub neptunes.
[3:30] Speaker 3: That's the split.
[3:31] Speaker 2: Yeah, before we debate how they got sorted, we have
[3:34] Speaker 2: to understand what these two categories actually look like on
[3:37] Speaker 2: the ground. Like, if I'm standing on a super Earth,
[3:40] Speaker 2: what are the actual geophysics happening beneath my boots?
[3:43] Speaker 3: Well, you are standing on a dense, rocky sphere of
[3:46] Speaker 3: compressed iron, nickel, and silicate mantle.
[3:50] Speaker 2: Okay, so just a giant rock basically.
[3:52] Speaker 3: Yeah. Compositionally, super earths are just scaled up terrestrial worlds.
[3:57] Speaker 3: But the physics of a scaled up Earth complete lately
[4:00] Speaker 3: change the surface environment. How So, at roughly one point
[4:04] Speaker 3: five times Earth's radius, assuming a rocky density, the mass
[4:08] Speaker 3: of that planet scales by the cube of its radius.
[4:11] Speaker 3: Oh wow, so you're dealing with the world that might
[4:13] Speaker 3: be three, four, even five times the mass of Earth.
[4:16] Speaker 3: The surface gravity would be just bone crushing, And.
[4:19] Speaker 2: I imagine the atmosphere is pretty intense too.
[4:21] Speaker 3: If it has a thin secondary atmosphere like Earth or Venus,
[4:24] Speaker 3: the pressure is dictated entirely by that intense gravitational Well,
[4:28] Speaker 3: tectonic activity could be wildly exaggerated or or the immense
[4:33] Speaker 3: lithospheric pressure could completely lock the crust, preventing plate tectonics entirely.
[4:37] Speaker 2: Okay, so it's a giant, heavy, potentially locked rock. But
[4:41] Speaker 2: then we leap across this empty one point eight radius
[4:44] Speaker 2: valley and we land on a sub neptune. These are
[4:47] Speaker 2: planets sitting at say two point five times the size
[4:50] Speaker 2: of Earth. Are they just even bigger, heavier rocks?
[4:53] Speaker 3: Not at all? And that is you know, the crucial
[4:56] Speaker 3: differentiator here. Okay, when we measure the mass of these
[4:59] Speaker 3: sub neptunes using radial velocity, basically observing how much their
[5:04] Speaker 3: gravity tugs on their host stars.
[5:06] Speaker 2: Right, the Wobble method exactly.
[5:08] Speaker 3: Yeah, And then we calculate their volume based on how
[5:11] Speaker 3: much starlight they block, Well, their overall bulk density just plummets.
[5:16] Speaker 3: They're incredibly puffy.
[5:17] Speaker 2: So they aren't solid surfaces.
[5:19] Speaker 3: No, The data dictates that a significant fraction of a
[5:22] Speaker 3: sub neptune's volume must be made up of low density materials.
[5:26] Speaker 3: Deep down in the center, there is almost certainly a
[5:28] Speaker 3: rocky or metallic core similar in mass to a super Earth.
[5:32] Speaker 2: They're wrapped around it.
[5:33] Speaker 3: An immense extended envelope of primordial gas. We're talking about
[5:37] Speaker 3: massive atmospheres of hydrogen and helium, the lightest elements in
[5:40] Speaker 3: the universe.
[5:41] Speaker 2: Or potentially incredibly thick layers of lighter molecular ices and fluids.
[5:46] Speaker 3: Right, yes, exactly. You couldn't land a ship on a
[5:49] Speaker 3: sub neptune. You would just sink through.
[5:51] Speaker 2: A cloud deck like falling into Jupiter.
[5:53] Speaker 3: Pretty much. You descend into an atmosphere where the pressure
[5:56] Speaker 3: and temperature increase exponentially until the gas become a supercritical fluid,
[6:01] Speaker 3: and that just blurs the line between liquid and gas entirely.
[6:04] Speaker 2: I'm trying to visualize this bimodal gap, and the closest
[6:08] Speaker 2: analogy I can come up with is like a clothing factory.
[6:13] Speaker 3: Clothing factory, okay, I like that.
[6:14] Speaker 2: Yeah, It's like walking into a massive warehouse that produces
[6:17] Speaker 2: millions of shirts. But you walk down the aisles and
[6:20] Speaker 2: you only see racks of size small and racks.
[6:23] Speaker 3: Of size large, and no mediums.
[6:25] Speaker 2: There isn't a single medium shirt in the entire building.
[6:29] Speaker 2: So the question actually becomes is the factory completely incapable
[6:33] Speaker 2: of physically stitching together a medium shirt.
[6:36] Speaker 3: Meaning the raw materials at the start of the assembly
[6:38] Speaker 3: line prevent.
[6:38] Speaker 2: It exactly, or is the factory churning out millions of mediums,
[6:44] Speaker 2: but there's something wrong with the fabric, and over a
[6:47] Speaker 2: few years they either shrink in the wash into smalls
[6:50] Speaker 2: or the fibers break down and they stretch out into larges.
[6:54] Speaker 3: The manufacturing defect versus the evolutionary degradation that really captures
[6:59] Speaker 3: the exact scin dividing the astronomical community right now.
[7:02] Speaker 2: Well, before we get to those two competing theories, I
[7:04] Speaker 2: have a theoretical question, sure, go for if the universe
[7:08] Speaker 2: actively avoids this one point eight radius middle ground, what
[7:12] Speaker 2: would a planet exactly that size actually look like if
[7:15] Speaker 2: one magically managed to exist?
[7:17] Speaker 3: Oh, that's a great question.
[7:19] Speaker 2: Like if you took the dense, heavy rock of a
[7:21] Speaker 2: super Earth and the puffy volatile envelope of a sub
[7:24] Speaker 2: Neptune and force them into a one point eight radius compromise,
[7:28] Speaker 2: what kind of world is that?
[7:29] Speaker 3: It would be a world at war with its own
[7:31] Speaker 3: internal physics. Really, Yeah, at exactly one point eight Earth radii,
[7:35] Speaker 3: assuming a standard rocky core mass, you're sitting precisely on
[7:39] Speaker 3: a thermodynamic and gravitational razor's edge.
[7:42] Speaker 2: Okay, so it's precarious.
[7:44] Speaker 3: Extremely the planet has managed to accrete a thin envelope
[7:48] Speaker 3: of hydrogen and helium gas, perhaps just one or two
[7:52] Speaker 3: percent of its total mass.
[7:53] Speaker 2: But because that gas is so incredibly light and puffy,
[7:56] Speaker 2: it accounts.
[7:57] Speaker 3: For a massive percentage of the planet's total volume.
[7:59] Speaker 2: So it's rocky core wearing a giant, bloated jacket of gas.
[8:03] Speaker 3: Yes, but the jacket doesn't fit properly. I love that
[8:06] Speaker 3: the gravity of the rocky core is locked in a constant,
[8:08] Speaker 3: delicate tug of war against the thermal kinetic energy of
[8:12] Speaker 3: the gas molecules. The hydrogen atoms want to bounce away,
[8:15] Speaker 3: heated by the star, while the core tries to pull
[8:18] Speaker 3: them back.
[8:19] Speaker 2: So a one point eight earth radius planet is just
[8:21] Speaker 2: fundamentally unstable.
[8:23] Speaker 3: Any slight alteration in its environment, a slight increase in
[8:26] Speaker 3: stellar radiation, a minor orbital shift, even a slow loss
[8:30] Speaker 3: of internal planetary heat, and that delicate balance collapses.
[8:34] Speaker 2: And what happens when it collapses.
[8:35] Speaker 3: The mechanism either strips the gas away entirely, leaving a
[8:39] Speaker 3: bare rock, or the planet was massive enough to hold
[8:41] Speaker 3: onto a much thicker jacket from the start, making it
[8:44] Speaker 3: a much larger subneptune.
[8:45] Speaker 2: The one point eight radius size is essentially a transition
[8:49] Speaker 2: zone of instability.
[8:50] Speaker 3: Precisely, it just can't hold that state.
[8:53] Speaker 2: Which perfectly sets up the two warring factions in astrophysics.
[8:57] Speaker 2: Trying to explain this exact instability. Let's tackle hypothesis one,
[9:02] Speaker 2: the shrinking gas dwarf theory.
[9:04] Speaker 3: Okay, the evolutionary model, right.
[9:06] Speaker 2: The idea that the factory actually is making medium shirts,
[9:09] Speaker 2: but they are shrinking in the wash.
[9:11] Speaker 3: The shrinking gas dwarf model posits that the radius valley
[9:14] Speaker 3: is not a feature of planetary birth, but an evolutionary
[9:17] Speaker 3: scar carved into the galactic population over hundreds of millions
[9:21] Speaker 3: of years. Okay. The core assertion here is radical in
[9:24] Speaker 3: its simplicity. It says that super earths and sub neptunes
[9:28] Speaker 3: are actually the exact same species of planet.
[9:31] Speaker 2: Wait, if they are the exact same species, how do
[9:34] Speaker 2: we get the bimodal gap. If every planet starts the same,
[9:36] Speaker 2: we should see a.
[9:37] Speaker 3: Continuum because of where they end up living.
[9:39] Speaker 2: Okay, explain that.
[9:40] Speaker 3: Under this hypothesis, during the chaotic early days of a
[9:43] Speaker 3: protoplanetary you know, the swirling cloud of gust and gas
[9:46] Speaker 3: around a newborn star, Every rocky core that reaches a
[9:50] Speaker 3: certain mass begins to aggressively sweethe up the abundant hydrogen
[9:53] Speaker 3: and helium gas from the nebula.
[9:55] Speaker 2: Right, So they're sucking up all that material.
[9:57] Speaker 3: Yeah, they all wrap themselves in those thick, puffy envelopes.
[10:01] Speaker 3: They are all born as sub neptunes, every single one
[10:03] Speaker 3: of them.
[10:04] Speaker 2: So the factory only makes large shirts exactly. Okay, So
[10:08] Speaker 2: the universe is initially populated entirely by these puffy gas dwarfs.
[10:13] Speaker 2: Where do the super earths come from?
[10:14] Speaker 3: From the violent temper of young stars?
[10:17] Speaker 2: Oh? Right? Young stars are basically toddlers.
[10:20] Speaker 3: Very angry toddlers. A newly ignited star is not the calm,
[10:25] Speaker 3: steady yellow dwarf like our sun is today. Young stars,
[10:29] Speaker 3: particularly in their first one hundred million years, are highly vulnerable.
[10:32] Speaker 2: They're just spinning out a lot of energy.
[10:34] Speaker 3: Incredibly intense fluxes of extreme ultraviolet or EUV radiation and
[10:40] Speaker 3: incredibly powerful stellar winds.
[10:42] Speaker 2: And EUV radiation interacts with atmospheres differently than visible.
[10:46] Speaker 3: Light are girastically differently. Visible light largely passes through an atmosphere,
[10:50] Speaker 3: warming the surface. That extreme ultraviolet radiation is entirely absorbed
[10:54] Speaker 3: by the very uppermost layers of a planet's.
[10:56] Speaker 2: Atmosphere like the thermosphere and exosphere.
[10:58] Speaker 3: Yes, and hydrogen and helium atoms absorb these high energy
[11:02] Speaker 3: EUV photons. The atoms undergo rapid photoonization and intense heating, So.
[11:09] Speaker 2: We are talking about superheating the outermost layer of the
[11:12] Speaker 2: planet's gas envelope.
[11:14] Speaker 3: We're talking about raising the kinetic energy of those gas
[11:16] Speaker 3: molecules to an extreme degree. Temperature at an atomic level
[11:21] Speaker 3: is just velocity. It's how fast the atoms are vibrating
[11:24] Speaker 3: and bouncing around.
[11:25] Speaker 2: Right, getting them all energized exactly.
[11:28] Speaker 3: If a young planet is orbiting close to its host star,
[11:30] Speaker 3: the EUV radiation dumps snowhich thermal energy into the upper
[11:33] Speaker 3: atmosphere that the velocity the hydrogen atoms begins to exceed
[11:37] Speaker 3: the escape velocity of the planet's gravity.
[11:40] Speaker 2: I usually picture atmospheric loss like a slow leak in
[11:42] Speaker 2: a tire, molecules occasionally drifting off into space one by one.
[11:46] Speaker 3: What you're describing is genes escape, which is a slow
[11:49] Speaker 3: thermal process, but close to a young flaring star, the
[11:53] Speaker 3: mechanism shift to something called hydrodynamic escape.
[11:55] Speaker 2: Hydrodynamic escape that sounds aggressive.
[11:58] Speaker 3: It is, It is not a slow The heating is
[12:01] Speaker 3: so intense and so rapid that the entire upper atmosphere
[12:04] Speaker 3: expands outward as a bulk fluid. The outward pressure of
[12:07] Speaker 3: the heated gas completely overwhelms the planet's gravity. It creates
[12:12] Speaker 3: a continuous, massive planetary wind. The atmosphere literally boils off
[12:17] Speaker 3: into the vacuum of space.
[12:19] Speaker 2: Carrying away vast percentages of the planet's mass over millions
[12:22] Speaker 2: of years.
[12:23] Speaker 3: Exactly.
[12:24] Speaker 2: This completely reframes how I think about a super Earth.
[12:27] Speaker 2: If this theory holds, a super Earth, isn't a planet
[12:30] Speaker 2: that formed from rocky material.
[12:32] Speaker 3: No, it's not.
[12:32] Speaker 2: It's a sub neptune that was fundamentally stripped naked.
[12:36] Speaker 3: It is the surviving, bare, rocky core of a dead
[12:39] Speaker 3: gas dwarf.
[12:40] Speaker 2: Wow, it's like holding a giant, fluffy marshmallow far too
[12:43] Speaker 2: close to a roaring, out of control campfire.
[12:46] Speaker 3: That's actually a great way to picture it.
[12:48] Speaker 2: At first, the marshmallow is huge and puffy, but the
[12:51] Speaker 2: intense radiant heat of the fire causes the outer layers
[12:53] Speaker 2: to catch fire, melt, and evaporate. You sit there holding it,
[12:57] Speaker 2: and eventually the entire white, fluffy exterior turns away completely.
[13:01] Speaker 3: Leaving you with nothing but that dense, black and hardcore
[13:04] Speaker 3: of caramelized sugar stuck to the stick.
[13:07] Speaker 2: Yes, the marshmallow is the sub Neptune, the campfire is
[13:11] Speaker 2: the young star's extreme ultraviolet radiation, and the blackened core
[13:16] Speaker 2: that survives is the super Earth.
[13:18] Speaker 3: The analogy holds up surprisingly well to the thermodynamic realities,
[13:22] Speaker 3: and crucially, it explains the spatial distribution we observe. How So,
[13:26] Speaker 3: the planets that formed or migrated too close to the
[13:29] Speaker 3: campfire experienced catastrophic hydrodynamic escape. Their hydrogen envelopes evaporated and
[13:35] Speaker 3: their radii shrank from two point five Earth radii down
[13:39] Speaker 3: to one point three or one.
[13:40] Speaker 2: Point five they crossed the valley.
[13:42] Speaker 3: Yes, the planets that happened to orbit further away, at
[13:45] Speaker 3: a safe distance where the EUV radiation was less intense,
[13:49] Speaker 3: retain their gas envelopes. They remained puffy subneptunes.
[13:52] Speaker 2: But hold on, let me push back on this. If
[13:54] Speaker 2: it's just a matter of distance from the star, stellar
[13:57] Speaker 2: radiation should decrease smoothly according to the inverse square.
[14:00] Speaker 3: It does.
[14:00] Speaker 2: Yes, it just gets gradually weaker the further you go.
[14:03] Speaker 2: So if the radiation gets gradually weaker, shouldn't atmospheric loss
[14:07] Speaker 2: be a gradual gradient.
[14:08] Speaker 3: I see where you're going.
[14:09] Speaker 2: Why wouldn't we see a ton of partially boiled marshmallows.
[14:13] Speaker 2: Why a perfectly empty gap exactly at one point eight radii?
[14:17] Speaker 2: Shouldn't there be planets that lost half their atmosphere and
[14:19] Speaker 2: just stopped right in the middle.
[14:21] Speaker 3: That is the exact mathematical hurdle the shwinking gas dwarf
[14:25] Speaker 3: theory has to solve, and the answer lies in the
[14:28] Speaker 3: exponential nature of atmospheric retension. Okay, unpack that for me,
[14:32] Speaker 3: gravity does not scale linearly with the thickness of a
[14:34] Speaker 3: gas envelope. Because hydrogen is so light. The difference between
[14:38] Speaker 3: an envelope that makes up one percent of the planet's
[14:40] Speaker 3: mass and an envelope that makes up five percent of its.
[14:43] Speaker 2: Mass it results in a massive difference in physical volume.
[14:46] Speaker 3: Right exactly, if a planet loses enough gas to shrink
[14:50] Speaker 3: to one point eight earth radii, the remaining gas envelope
[14:54] Speaker 3: is incredibly tenuous. It is highly extended and weakly bound
[14:58] Speaker 3: to the rocky.
[14:58] Speaker 2: Core, so it's essentially a tipping point.
[15:00] Speaker 3: Precisely once hydrodynamic escape manages to strip an atmosphere down
[15:04] Speaker 3: to that critical one point eight radius threshold, the planet's
[15:08] Speaker 3: gravitational grip on the remaining gas becomes so pathetic that
[15:12] Speaker 3: the rest of the atmosphere is lost incredibly rapidly.
[15:14] Speaker 2: Oh, I get it. It doesn't pause in the valley,
[15:17] Speaker 2: It falls off a cliff.
[15:18] Speaker 3: Yes, the planet accelerates through the one point eight radius
[15:22] Speaker 3: size and a blink of cosmic time, shrinking rapidly down
[15:25] Speaker 3: to the bare rock.
[15:26] Speaker 2: So the valley is empty because planets physically cannot maintain
[15:30] Speaker 2: stability at that size under stellar irradiation.
[15:33] Speaker 3: Exactly, It's an unstable equilibrium.
[15:35] Speaker 2: It is an incredibly elegant theory. It uses brutal, violent astrophysics,
[15:40] Speaker 2: atmospheric boiling, extreme ultraviolet radiation, orbital dynamics to explain a
[15:47] Speaker 2: simple statistical anomaly.
[15:48] Speaker 3: It really is a beautiful model.
[15:50] Speaker 2: But as compelling as the shrinking gas dwarf theory is,
[15:54] Speaker 2: it relies entirely on the assumption that every planet starts
[15:57] Speaker 2: as a puffy gas world.
[15:58] Speaker 3: And that's where the contention lies.
[16:00] Speaker 2: And I know there is an entire competing faction of
[16:02] Speaker 2: planetary geologists and astrophysicists who look at that exact same
[16:06] Speaker 2: bimodal graph and declare that the evolutionary theory is completely backwards.
[16:10] Speaker 3: Which introduces hypothesis too the dense water worlds.
[16:14] Speaker 2: Okay, let's get into the rival camp.
[16:16] Speaker 3: This theory discards the shrinking in the wash concept entirely.
[16:21] Speaker 3: This faction argues that the Radius Valley is not a
[16:24] Speaker 3: graveyard of stripped atmospheres, it is a fundamental imprint of
[16:27] Speaker 3: planetary birth.
[16:28] Speaker 2: The factory never made the medium shirts exactly.
[16:32] Speaker 3: Super earths and sub neptunes are born radically fundamentally different
[16:36] Speaker 3: from day one, using completely different raw materials.
[16:39] Speaker 2: But if they are born in the same solar system,
[16:42] Speaker 2: how do they get access to completely different raw materials?
[16:45] Speaker 2: They are forming out of the exact same protoplanetary disc.
[16:48] Speaker 3: They're forming in the same disk, but the thermodynamic environment
[16:52] Speaker 3: inside that disc changes violently depending on your radial distance
[16:55] Speaker 3: from the infant star.
[16:56] Speaker 2: Okay.
[16:57] Speaker 3: The key to this entire hypothesis hinges on an invisible
[17:00] Speaker 3: boundary line within the disk called the snow line or
[17:03] Speaker 3: the ice line.
[17:04] Speaker 2: We need to really dive into the mechanics of this
[17:07] Speaker 2: snow line because this feels like the lynch pin of
[17:09] Speaker 2: the whole debate. What physically happens at this boundary.
[17:12] Speaker 3: To understand the snow line, you have to look at
[17:14] Speaker 3: the temperature gradient of the protoplanetary nebula right next to
[17:18] Speaker 3: the young Star. The ambient temperature of the swirling gas
[17:22] Speaker 3: and dust is thousands of degrees. It's a furnace, a
[17:26] Speaker 3: total furnace. In that environment, voltile compounds, specifically water, ammonia,
[17:32] Speaker 3: and methane, cannot exist in a solid state. The thermal
[17:35] Speaker 3: energy is just too high. Water exists exclusively as a
[17:40] Speaker 3: superheated vapor.
[17:41] Speaker 2: So it's basically just humidity in space.
[17:42] Speaker 3: Precisely, and vapor cannot clump together to build a planet.
[17:46] Speaker 2: Makes sense.
[17:47] Speaker 3: Therefore, the only materials capable of condensing into solid grains
[17:50] Speaker 3: in the Inner Solar System are heavy elements with incredibly
[17:54] Speaker 3: high melting points iron, nickels, silicates, rocks.
[17:57] Speaker 2: So planets that accreate close to the star inside the
[18:00] Speaker 2: snow line are forced to build themselves entirely out of
[18:03] Speaker 2: dry refractory material.
[18:04] Speaker 3: Yes, they become rocky super earths.
[18:06] Speaker 2: But as you move further away from the star, the
[18:08] Speaker 2: temperature of the nebula drops.
[18:10] Speaker 3: It drops significantly, and eventually at a specific distance, perhaps
[18:14] Speaker 3: two or three times the distance Earth is from the Sun,
[18:17] Speaker 3: the temperature of the vacuum crosses a critical thermodynamic threshold,
[18:21] Speaker 3: which is what exactly about one hundred and fifty kelvin.
[18:24] Speaker 3: At this temperature, water vapor undergoes desublimation. It transitions directly
[18:28] Speaker 3: from a gas into microscopic solid ice greens.
[18:32] Speaker 2: You cross the snow line and suddenly it's snowing in space.
[18:35] Speaker 3: Literally, the amount of solid mass available to build planets
[18:39] Speaker 3: suddenly spikes massively. Water is one of the most abundant
[18:43] Speaker 3: molecules in the universe, right.
[18:45] Speaker 2: But inside the snow line it's useless vapor exactly.
[18:48] Speaker 3: But outside the snow line it is solid building blocks.
[18:52] Speaker 3: Planets forming out there aren't just accreting dust and rock.
[18:54] Speaker 3: They're sweeping up billions of tons of solid ice.
[18:58] Speaker 2: Okay, So this hypothesis argues that the sub neptunes we
[19:00] Speaker 2: observe today are not rocky cores hiding inside massive hydrogen.
[19:04] Speaker 3: Envelopes, right, they are dense water worlds that form beyond
[19:08] Speaker 3: the snow line, heavily enriched by ice, and then later
[19:11] Speaker 3: migrated inward toward the star.
[19:13] Speaker 2: Okay, when you say water world, my brain instantly goes
[19:16] Speaker 2: to Earth. We literally call Earth the blue marble. We
[19:19] Speaker 2: have the Pacific.
[19:20] Speaker 3: Ocean, right, But structurally Earth's water is basically a wet
[19:23] Speaker 3: coat of paint exactly.
[19:25] Speaker 2: If you look at the total mass of our planet,
[19:27] Speaker 2: water makes up roughly zero point zero two percent. It
[19:31] Speaker 2: is a statistical rounding error compared to the iron core,
[19:35] Speaker 2: and the silicate mantle is tiny. So how much water
[19:39] Speaker 2: are we talking about for one of these sub neptunes.
[19:42] Speaker 3: The mass fraction calculations for these dense water worlds suggest
[19:45] Speaker 3: they could be comprised of fifty percent rock and fifty
[19:49] Speaker 3: percent water by mass.
[19:50] Speaker 2: Fifty percent water by mass. That completely defies comprehension.
[19:54] Speaker 3: It's staggering.
[19:55] Speaker 2: I can't even picture what the structural geophysics of a
[19:58] Speaker 2: planet composed of half way water and half rock would entail.
[20:02] Speaker 2: If a planet is two and a half times the
[20:03] Speaker 2: size of Earth and half of its mass is water,
[20:06] Speaker 2: wouldn't that ocean just be thousands of miles deep?
[20:09] Speaker 3: Oh? Absolutely?
[20:10] Speaker 2: Does it even have a rocky ocean floor.
[20:12] Speaker 3: The physical reality of a fifty percent water mass planet
[20:15] Speaker 3: is far stranger than just a deep ocean. You have
[20:17] Speaker 3: to consider the hydrostatic pressure gravity on a planet of
[20:20] Speaker 3: that size is pulling all that massive amount of water
[20:23] Speaker 3: toward the center. As you dive down through the liquid
[20:26] Speaker 3: surface ocean, the pressure increases exponentially.
[20:29] Speaker 2: Like reaching the bottom of the Mariana Trench, but way worse.
[20:33] Speaker 3: Orders of magnitude worse. Long before you ever reach the
[20:36] Speaker 3: rocky core, the pressure becomes so utterly immense that the
[20:39] Speaker 3: water molecules are physically forced to rearrange their.
[20:43] Speaker 2: Structural lattice weight forced to rearrange, meaning the water stops
[20:47] Speaker 2: being liquid.
[20:48] Speaker 3: The pressure overrides the temperature. Even if the internal temperature
[20:52] Speaker 3: of the planet is thousands of degrees sar passed the
[20:54] Speaker 3: normal boiling point of water. The sheer crushing weight of
[20:57] Speaker 3: the ocean above physically prevents the water molecules from moving freely.
[21:01] Speaker 2: So what happens to them?
[21:03] Speaker 3: They lock into highly exotic crystalline solid states. We are
[21:07] Speaker 3: talking about high pressure phases of ice like ice seven,
[21:10] Speaker 3: ice ten, or superioric water.
[21:12] Speaker 2: Hot solid ice. That sounds like a contradiction in terms
[21:15] Speaker 2: exactly a superioric water.
[21:17] Speaker 3: It is a bizarre phase of matter where quantum mechanics
[21:20] Speaker 3: and fluid dynamics intersect under millions of atmospheres of pressure.
[21:25] Speaker 3: The oxygen atoms in the water molecules lock into a rigid,
[21:30] Speaker 3: solid crystalline lattice.
[21:32] Speaker 2: Okay, so a solid frame.
[21:34] Speaker 3: But the pressure is so intense that the hydrogen atoms decouple.
[21:38] Speaker 3: The hydrogen protons become completely delocalized and actually flow freely
[21:43] Speaker 3: through the solid oxygen lattice, acting almost like electrons in
[21:46] Speaker 3: a metal.
[21:47] Speaker 2: So you have a solid matrix of oxygen with liquid
[21:50] Speaker 2: hydrogen flowing through it.
[21:51] Speaker 3: Exactly, it conducts electricity like a metal. A dense water
[21:54] Speaker 3: world wouldn't have a normal ocean floor.
[21:56] Speaker 2: What would it have.
[21:57] Speaker 3: It would have a surface envelope of supercritical steam transitioning
[22:01] Speaker 3: into a vast, crushing liquid ocean, which eventually solidifies into
[22:05] Speaker 3: thousands of miles of glowing metallic superionic ice. Glowing metallic ice,
[22:10] Speaker 3: and that's wrapped around whatever rocky core lies at the
[22:13] Speaker 3: very center. The magnetic fields generated by a spinning mantle
[22:16] Speaker 3: of superionic water would be incredibly complex.
[22:19] Speaker 2: I can't even imagine.
[22:21] Speaker 3: They'd likely be non dipolar, meaning they might have multiple
[22:23] Speaker 3: north and south poles scattered all across the planet.
[22:26] Speaker 2: That is genuinely one of the most alien things I
[22:28] Speaker 2: have ever heard.
[22:29] Speaker 3: It's wild physics.
[22:30] Speaker 2: But let me bring this wildly exotic geology. Back to
[22:33] Speaker 2: the core mystery. How does building a fifty to fifty
[22:37] Speaker 2: superioric water world explain the one point eight radius valley?
[22:41] Speaker 3: Good question.
[22:42] Speaker 2: If planets form from dry rock inside the snow line
[22:46] Speaker 2: and half ice outside the snow line, why wouldn't we
[22:48] Speaker 2: just see a mix of sizes. Why the stark gap.
[22:51] Speaker 3: The gap is created by the physical limits of the
[22:54] Speaker 3: materials themselves. Imagine playing with building blocks. Okay, if you
[22:58] Speaker 3: only have high density dry rock available inside the snow line,
[23:02] Speaker 3: there is a maximum size a rocky planet can realistically
[23:05] Speaker 3: reach before it runs out of material in its local
[23:08] Speaker 3: orbital lane.
[23:09] Speaker 2: Makes sense.
[23:09] Speaker 3: Based on planetary accretion models, the maximum physical size a
[23:13] Speaker 3: dry rocky super Earth generally achieves is roughly one point
[23:17] Speaker 3: four to one point five times the radius of Earth.
[23:20] Speaker 3: To get bigger than that with purely dry rock requires
[23:23] Speaker 3: highly improbable collision events.
[23:25] Speaker 2: Okay, so the rock planets naturally cap out around one
[23:27] Speaker 2: point five exactly.
[23:29] Speaker 3: Now, on the other side of the snow line, you
[23:31] Speaker 3: have an abundance of low density ice. Because ice is
[23:34] Speaker 3: far less dense than rock, A planet composed of fifty
[23:37] Speaker 3: percent water and fifty percent rock is naturally going to
[23:40] Speaker 3: be physically larger than a pure rock planet of the
[23:42] Speaker 3: exact same mass.
[23:43] Speaker 2: Right, a half water world simply takes up more.
[23:45] Speaker 3: Volume because water isn't as dense as iron, exactly, and
[23:49] Speaker 3: because water is so abundant out there, these planets accrete
[23:52] Speaker 3: massive amounts of it very quickly. The minimum physical size
[23:55] Speaker 3: of a planet born with that fifty to fifty ice
[23:58] Speaker 3: rock composition tends to actually inflate the planet's radius too,
[24:02] Speaker 3: roughly two point four to two point six times the
[24:05] Speaker 3: size of Earth.
[24:06] Speaker 2: Ah, I see it now. The valley isn't an evolutionary scar,
[24:10] Speaker 2: It's an empty space between two completely different recipes. Nature
[24:14] Speaker 2: can bake a pure rock planet up to size one
[24:16] Speaker 2: point five, and when nature bakes a half water planet,
[24:19] Speaker 2: it puffs up to at least size two point four.
[24:21] Speaker 3: Precisely, under hypothesis two, the bimodal distribution directly maps to
[24:26] Speaker 3: the snow line. There are no one point eight earth
[24:29] Speaker 3: radius planets because neither the dryer recipe nor the wet
[24:33] Speaker 3: recipe physically results in a planet of that specific volume.
[24:37] Speaker 2: No atmospheric stripping is required.
[24:38] Speaker 3: No planetary sunburns, just an invisible thermodynamic boundary in the
[24:43] Speaker 3: primordial disc dictating planetary destiny based on available building materials.
[24:48] Speaker 2: So we have reached an incredible scientific impasse. The observational
[24:52] Speaker 2: data the empty one point eight gap is undisputed. But
[24:55] Speaker 2: we have two fiercely competing camps with completely opposing.
[24:59] Speaker 3: Explanations with very solid math. Right.
[25:02] Speaker 2: Hypothesis one says it's hydrodynamic atmospheric stripping, boiling sub neptunes
[25:06] Speaker 2: into super earths over millions of years. Hypothesis two says
[25:09] Speaker 2: it's the snow line, forcing planets to be born as
[25:12] Speaker 2: either small dry rocks or massive superioric water worlds.
[25:15] Speaker 3: Exactly.
[25:16] Speaker 2: Both models utilize rigorous thermodynamic physics. Both models mathematically account
[25:20] Speaker 2: for the bimodal distribution. Both models sound perfectly plausible as
[25:24] Speaker 2: an astronomer, How do you possibly settle a debate when
[25:27] Speaker 2: the existing data set supports both factions equally? Well?
[25:30] Speaker 3: Well, the only way to break at deadlock in historical
[25:33] Speaker 3: sciences and planetary formation is ultimately a historical science, is
[25:38] Speaker 3: to find a way to look back in time.
[25:40] Speaker 2: Okay, how do we do that.
[25:41] Speaker 3: We're currently looking at a population of exoplanets that are
[25:45] Speaker 3: billions of years old. We're looking at the final product
[25:48] Speaker 3: to definitively prove which mechanism is responsible, we have to
[25:52] Speaker 3: catch these systems in the act of forming. We have
[25:56] Speaker 3: to find and observe extremely young exoplanets.
[25:59] Speaker 2: That logically makes perfect sense. If hypothesis two, the water
[26:03] Speaker 2: world theory, is correct, then the super earths and sub
[26:07] Speaker 2: neptunes are born completely distinct.
[26:09] Speaker 3: Correct.
[26:09] Speaker 2: So if we look at a solar system that was
[26:11] Speaker 2: literally just born, we should see the bimodal gap already
[26:14] Speaker 2: firmly established. The super earths will already exist, yes.
[26:18] Speaker 3: And conversely, if hypothesis won the shrinking gased war theory
[26:22] Speaker 3: is correct, the valley shouldn't exist yet because.
[26:24] Speaker 2: The hydrodynamic escape mechanism takes hundreds of millions of years
[26:28] Speaker 2: to fully boil away a hydrogen envelope.
[26:30] Speaker 3: Precisely, so if we look at a newly formed stellar system,
[26:35] Speaker 3: we should see absolutely no bare, rocky super earths. We
[26:39] Speaker 3: should see a completely unbroken population of massive, puffy sub
[26:43] Speaker 3: neptunes just waiting for the star to slowly strip them down.
[26:47] Speaker 2: The test is so clean, it's a binary outcome. So
[26:50] Speaker 2: why is this even a debate? Why haven't the astronomers
[26:53] Speaker 2: just pointed their telescopes at the stellar nurseries, cataloged the
[26:56] Speaker 2: baby planets and publish the answer.
[26:58] Speaker 3: Because the universe actively fights our attempts to observe its infancy,
[27:02] Speaker 3: we have collided with a monumental observational catch twenty two.
[27:05] Speaker 3: Really yeah, Identifying and characterizing young exoplanets is one of
[27:09] Speaker 3: the most excruciatingly difficult tasks in modern observational astrophysics. Let's
[27:14] Speaker 3: look at the harsh statistical reality of our current catalog.
[27:17] Speaker 3: We have confirmed roughly six thousand exoplanets across the galaxy. Okay,
[27:21] Speaker 3: do you know how many of those six thousand are
[27:22] Speaker 3: definitively characterized as young?
[27:24] Speaker 2: Well, first, define young in an astrophysical context, because to us,
[27:28] Speaker 2: the dinosaurs dying out sixty five million years ago is
[27:31] Speaker 2: ancient history.
[27:32] Speaker 3: Fair point. In stellar evolution, fifty million years is the
[27:36] Speaker 3: crucial window for a star like our Sun, which has
[27:40] Speaker 3: a main sequence lifespan of ten billion years, fifty million
[27:44] Speaker 3: years is absolute infancy.
[27:46] Speaker 2: Okay, just a baby.
[27:47] Speaker 3: The proto planetary disk of gas and dust has only
[27:50] Speaker 3: recently dissipated, clearing our line of sight. The planets have
[27:54] Speaker 3: finished their primary accretion, but the long term evolutionary mechanics
[27:58] Speaker 3: like atmospheric stripping an enough time to drastically alter the landscape.
[28:02] Speaker 2: Fifty million years is the exact temporal sweet spot we
[28:05] Speaker 2: need to test these theories exactly. Okay, so fifty million
[28:09] Speaker 2: years is the cutoffs. Out of the six thousand planets
[28:11] Speaker 2: we know about, how many fit that alibi? Roughly twenty
[28:14] Speaker 2: twenty out of six thousand.
[28:16] Speaker 3: It is a statistically insignificant rounding error.
[28:19] Speaker 2: But why is it just a matter of telescope time?
[28:21] Speaker 2: Are we not looking in the right places?
[28:23] Speaker 3: Not exactly?
[28:24] Speaker 2: I mean, if we know where the stellar nurseries are,
[28:26] Speaker 2: like the Orion nebula or the Pleats, why can't we
[28:29] Speaker 2: just dedicate the James Webb Space Telescope or the Kepler
[28:33] Speaker 2: Archives to stare specifically at those clusters and find the planets.
[28:37] Speaker 3: Because young stars are actively hostile to the methods we
[28:40] Speaker 3: use to find planets, this isn't a problem of telescope aperture.
[28:44] Speaker 3: It is a problem of signal to noise ratio.
[28:46] Speaker 2: Okay, break that down. For me to.
[28:48] Speaker 3: Understand why we only have twenty young planets, you have
[28:51] Speaker 3: to understand the sheer chaos of a young stellar environment.
[28:55] Speaker 3: The primary method humanity uses to discover exoplanets is the
[29:00] Speaker 3: transit photometry method.
[29:01] Speaker 2: That's the method where we wait for a planet to
[29:03] Speaker 2: pass in front of a star and measure the microscopic
[29:06] Speaker 2: shadow it casts right the star dims slightly.
[29:10] Speaker 3: Yes, we measure the photometric light curve. We stare at
[29:14] Speaker 3: a star, establish a baseline of its brightness, and wait
[29:17] Speaker 3: for a tiny, periodic U shaped dip in that brightness
[29:20] Speaker 3: caused by an opaque spherical object. The planet eclipsing a
[29:23] Speaker 3: fraction of the stellar disc.
[29:25] Speaker 2: And the size of the dip tells us the size
[29:26] Speaker 2: of the planet exactly.
[29:28] Speaker 3: The transit depth is proportional to the square of the
[29:30] Speaker 3: ratio of the planet's radius to the stars radius. It's
[29:34] Speaker 3: incredibly precise geometry.
[29:35] Speaker 2: So what's the problem.
[29:36] Speaker 3: This method fundamentally requires the star itself to be stable.
[29:40] Speaker 3: If you are looking for a dip in light that
[29:42] Speaker 3: is a fraction of a percent, the flashlight you are
[29:45] Speaker 3: staring at needs to emit a perfectly constant.
[29:48] Speaker 2: Beam, and young stars are not constant.
[29:50] Speaker 3: Young stars are violent, temperamental magnetic nightmares. Night they really are.
[29:57] Speaker 3: They are rapidly spinning, meaning their internal dynamos are operating
[30:01] Speaker 3: in overdrive. Their magnetic fields twist and snap, creating massive
[30:05] Speaker 3: acoustic and magnetic disturbances across the photosphere. They are covered
[30:09] Speaker 3: in giant star spots, dark cool regions of immense magnetic.
[30:14] Speaker 2: Pressure like our sun spots, but scaled up, scaled.
[30:17] Speaker 3: Up by orders of magnitude, and as the young star rotates,
[30:20] Speaker 3: these massive dark spots rotate into our field of view
[30:23] Speaker 3: and then disappear around the other side. This causes the
[30:26] Speaker 3: overall brightness of the star to fluctuate wildly oh from
[30:30] Speaker 3: our perspective on Earth, a rotating star spot causes a
[30:33] Speaker 3: dip in the light curve that looks agonizingly similar to
[30:36] Speaker 3: a transiting.
[30:36] Speaker 2: Planet, so it generates thousands of false positives. You think
[30:39] Speaker 2: you've found a young planet, but it's just a magnetic
[30:42] Speaker 2: blemish on the star rotating past.
[30:44] Speaker 3: It gets worse, of course it does. Young stars also
[30:46] Speaker 3: flare constantly. Magnetic reconnection events release massive instantaneous bursts of
[30:52] Speaker 3: thermal energy and radiation. These flares create sudden, massive spikes
[30:57] Speaker 3: in the light curve.
[30:58] Speaker 2: So the data is a mess.
[31:00] Speaker 3: If you point a standard optical telescope like Kepler or
[31:03] Speaker 3: tests at a twenty million year old star cluster, the
[31:06] Speaker 3: resulting photometric data doesn't look like a flat line with
[31:09] Speaker 3: occasional neat dips. It looks like the seismograph of a
[31:12] Speaker 3: magnitude nine earthquake. Wow, it is a jagged, chaotic, violently
[31:16] Speaker 3: noisy mess. Trying to find the delicate zero point one
[31:20] Speaker 3: percent U shaped dip of a transitting sub neptune hidden
[31:24] Speaker 3: inside the blinding spikes of flares and the rolling hills
[31:27] Speaker 3: of starspots is fundamentally impossible With standard optical sensors.
[31:31] Speaker 2: The star's own intrinsic noise completely grounds out the planetary signal. Exactly,
[31:36] Speaker 2: we are trying to listen to the delicate ring of
[31:38] Speaker 2: a silver bell in a room where a teenager is
[31:40] Speaker 2: testing out a wall of heavy metal amplifiers.
[31:43] Speaker 3: That is a perfect articulation of the problem, and that
[31:46] Speaker 3: is why we are stuck with only twenty young planets.
[31:48] Speaker 3: Our general purpose telescopes simply cannot filter the heavy metal
[31:52] Speaker 3: right to solve the radius valley, we can't just look harder.
[31:56] Speaker 3: We have to look differently. We need a tool custom
[31:58] Speaker 3: built to silence the stellar noise.
[32:01] Speaker 2: Which brings us to the ultimate architectural response to this crisis,
[32:05] Speaker 2: the proposed blueprint for the Early Evolution Explorer, or EVE
[32:09] Speaker 2: Yes EVE. This is a mission concept specifically designed from
[32:12] Speaker 2: the ground up to solve the Radius Valley catch twenty two.
[32:17] Speaker 2: Let's break down the mission parameters of EVE, because the
[32:19] Speaker 2: scale of ambition here is just staggering.
[32:22] Speaker 3: EVE is not designed to be a general observatory. It
[32:26] Speaker 3: is a highly specialized, targeted, single purpose instrument. Its sole
[32:30] Speaker 3: objective is to drastically increase the sensus of characterized planets
[32:35] Speaker 3: younger than fifty million years.
[32:36] Speaker 2: Okay, so how does it do that.
[32:38] Speaker 3: To achieve this, the EVE mission proposes targeting thirty specific
[32:42] Speaker 3: known fields of young scullar clusters.
[32:44] Speaker 2: It's pointing a sniper rifle directly at the cosmic maternity wards.
[32:48] Speaker 3: And the observational timeline is rigorous. The spacecraft is designed
[32:51] Speaker 3: to stare at each of these thirty distinct fields continuously
[32:54] Speaker 3: without interruption, for thirty days straight.
[32:56] Speaker 2: Thirty days of uninterrupted staring at a single patch of sky.
[33:00] Speaker 2: That's intense.
[33:01] Speaker 3: Over its proposed two point five year primary mission lifespan,
[33:05] Speaker 3: EVE aims to capture high precision photometric light curves from
[33:10] Speaker 3: roughly twenty thousand newly formed stars.
[33:13] Speaker 2: Let's talk about those numbers. Twenty thousand young stars is
[33:16] Speaker 2: an incredible sample size compared to the twenty planets we
[33:20] Speaker 2: currently have. But to get there, why the need for
[33:23] Speaker 2: thirty days of continuous staring? Why not just scan the
[33:26] Speaker 2: scay rapidly?
[33:27] Speaker 3: Because of the orbital mechanics of the transit method, if
[33:30] Speaker 3: a planet is orbiting a young star every ten days,
[33:33] Speaker 3: it only transits the star, casting that shadow for a
[33:36] Speaker 3: few hours during that ten day orbit.
[33:37] Speaker 2: Okay, so you have to catch it right at that moment.
[33:40] Speaker 3: Right If you only look at the star once a week,
[33:42] Speaker 3: you have a massive probability of missing the transit entirely.
[33:45] Speaker 3: And to confirm a planet, you can't just see one dip.
[33:48] Speaker 3: You need to see at least three periodic dips to
[33:50] Speaker 3: prove its an orbiting body and calculate its orbital period.
[33:53] Speaker 2: So steering continuously for thirty days guarantees one hundred percent
[33:57] Speaker 2: duty cycle, ensuring you catch multiple transits for any planet
[34:00] Speaker 2: orbiting close to the star.
[34:02] Speaker 3: It maximizes the geometric probability of catching the shadow.
[34:06] Speaker 2: But what I find truly fascinating about the EVE mission
[34:09] Speaker 2: architecture is what they explicitly intend.
[34:12] Speaker 3: To ignore, the exclusionless Yeah.
[34:14] Speaker 2: The proposal dictates that the mission will focus exclusively on
[34:17] Speaker 2: small planets, sub neptunes, and super earths, and it will
[34:21] Speaker 2: actively deliberately exclude any search for hot jupiters.
[34:24] Speaker 3: Yes, it is a strict mandate of the data processing pipeline.
[34:28] Speaker 2: I have to push back on that logic. Hot Jupiters
[34:31] Speaker 2: are massive gas giants, orbitting incredibly close to their stars.
[34:35] Speaker 2: They block a huge metal light. They're the easiest targets
[34:37] Speaker 2: to spot. If you are building a multimillion dollar space
[34:41] Speaker 2: telescope and staring at twenty thousand stars, why in the
[34:44] Speaker 2: world would you intentionally configure the software to ignore the biggest,
[34:48] Speaker 2: most obvious discoveries. It feels like going on an African
[34:51] Speaker 2: sofar with the state of the art camera and actively
[34:53] Speaker 2: turning it off every time an elephant walks by so
[34:56] Speaker 2: you can focus on photographing a specific species of beetle.
[34:59] Speaker 2: Why ignore the elephant?
[35:00] Speaker 3: Because the elephants do not help you answer the fundamental
[35:03] Speaker 3: question driving the mission. EVE is not a fishing expedition
[35:07] Speaker 3: meant to catch everything in the ocean. It is an
[35:10] Speaker 3: experiment designed to test a specific thermodynamic hypothesis.
[35:15] Speaker 2: But aren't hot Jupiter's relevant.
[35:17] Speaker 3: Hot Jupiters are fascinating, sure, but their formation and evolutionary
[35:21] Speaker 3: pathways are entirely distinct from the small, rocky planets involved
[35:25] Speaker 3: in the radius valley debate. How because of their sheer mass,
[35:29] Speaker 3: a hot jupiter is so incredibly massive hundreds of times
[35:32] Speaker 3: the mass of Earth, that its gravitational well is virtually insurmountable.
[35:37] Speaker 3: Even if a hot jupiter orbits blisteringly close to a
[35:40] Speaker 3: young flaring star, the extreme ultraviolet radiation is completely incapable
[35:45] Speaker 3: of inducing hydrodynamic escape.
[35:47] Speaker 2: Oh because it's just too heavy.
[35:49] Speaker 3: Exactly, the gas molecules can never reach escape velocity because
[35:53] Speaker 3: the planet's gravity is too powerful. A hot jupiter does
[35:56] Speaker 3: not boil away, so.
[35:56] Speaker 2: They don't shrink right.
[35:58] Speaker 3: Therefore, hot jupiter have absolutely zero relevance to the shrinking
[36:02] Speaker 3: gas dwarf theory or the water world theory. Searching for them,
[36:06] Speaker 3: cataloging their transits and processing their light curves would consume
[36:10] Speaker 3: incredibly valuable computational bandwidth and data downlink capacity that must
[36:16] Speaker 3: be preserved for the faint microscopic signals of the sub neptunes.
[36:20] Speaker 2: It is an exercise and rigorous scientific discipline, it really is.
[36:24] Speaker 3: Eve ignores the elephants to ensure it doesn't miss a
[36:27] Speaker 3: single beetle.
[36:28] Speaker 2: Okay, the discipline makes sense preserve the bandwidth for the
[36:30] Speaker 2: targets that actually matter. But that brings us right back
[36:33] Speaker 2: to the central problem we just.
[36:34] Speaker 3: Discussed, the noise.
[36:35] Speaker 2: Even if Eve is staring continuously for thirty days, and
[36:39] Speaker 2: even if it's focused entirely on small planets, it is
[36:42] Speaker 2: still staring at twenty thousand violently chaotic flaring spotted young stars.
[36:47] Speaker 2: The data is still going to look like an earthquake seismograph.
[36:50] Speaker 3: Absolutely.
[36:51] Speaker 2: How does Eve's telescope design actually solve the heavy metal problem?
[36:55] Speaker 2: How does it filter the stellar noise to find those
[36:57] Speaker 2: tiny dips?
[36:59] Speaker 3: Eve saw it through an ingenious application of multi band photometry.
[37:03] Speaker 3: The spacecraft doesn't just have one camera len staring at
[37:06] Speaker 3: the star. It utilizes a three sensor solution.
[37:10] Speaker 2: Three sensules.
[37:10] Speaker 3: It splits the incoming starlight and feeds it simultaneously into
[37:14] Speaker 3: three distinct detectors, each calibrated to measure a completely different
[37:18] Speaker 3: wavelength of the electromagnetic spectrum. It has a near ultraviolet sensor,
[37:23] Speaker 3: an optical sensor which sees the visible light we see,
[37:26] Speaker 3: and a near infrared sensor.
[37:27] Speaker 2: The three sensor solution, why is splitting the light into ultraviolet, optical,
[37:32] Speaker 2: and infrared. The key to canceling out the stellar noise.
[37:35] Speaker 3: It hinges on the physical differences between a geometric shadow
[37:39] Speaker 3: and a thermodynamic energy burst. Let's look at the planet first. Sure,
[37:44] Speaker 3: a transiting planet is an opaque physical object. When it
[37:47] Speaker 3: passes in front of the star, it blocks the star's light. Crucially,
[37:51] Speaker 3: a rock blocks ultraviolet light just as effectively as it
[37:54] Speaker 3: blocks optical light and infrared light.
[37:56] Speaker 2: Because a shadow is dark across the entire spectrum.
[37:59] Speaker 3: Correct if a dip in the light curve is caused
[38:02] Speaker 3: by a real planet, that exact same U shaped dip
[38:05] Speaker 3: will register simultaneously on the ultraviolet sensor, the optical sensor,
[38:09] Speaker 3: and the infrared sensor. The drop in flux is uniform
[38:12] Speaker 3: across all wavelengths.
[38:14] Speaker 2: But a solar flare isn't a shadow.
[38:16] Speaker 3: A stellar flare is an explosive magnetic reconnection event. It
[38:20] Speaker 3: is a massive sudden release of thermal energy, and the
[38:23] Speaker 3: physics of black body radiation and emission spectra dictate that
[38:27] Speaker 3: this sudden release of energy is not distributed evenly across
[38:31] Speaker 3: the electromagnetic spectrum.
[38:32] Speaker 2: Oh I see where this is going.
[38:34] Speaker 3: When a young star flares the vast majority of that
[38:37] Speaker 3: released energy spikes violently in the high energy, short wavelength
[38:41] Speaker 3: end of the spectrum. Specifically, flares shine incredibly brightly in
[38:45] Speaker 3: the near ultraviolet band.
[38:46] Speaker 2: AH, so the ultraviolet sensor isn't there to find the
[38:49] Speaker 2: planet exactly.
[38:50] Speaker 3: The near ultraviolet or NUV sensor acts as a highly
[38:54] Speaker 3: sensitive flare alarm system. When the star throws a tantrum,
[38:57] Speaker 3: the NUV sensor registers an enormous, unmistakeable spike in ultraviolet flux.
[39:01] Speaker 2: And the other sensors.
[39:02] Speaker 3: Meanwhile, the optical and infrared sensors might only register a moderate,
[39:07] Speaker 3: confusing bump. By continuously monitoring the NUV channel, the missions
[39:12] Speaker 3: onboard computers know exactly when a flare is happening, exactly
[39:16] Speaker 3: how intense it is, and exactly how its energy distribution
[39:19] Speaker 3: should bleed into the optical channels.
[39:21] Speaker 2: So it isolates the heavy metal music exactly.
[39:24] Speaker 3: The EVE data processing pipeline takes the jagged, screaming ultraviolet
[39:29] Speaker 3: light curve, uses it to map the exact temporal profile
[39:33] Speaker 3: of the star's magnetic activity, and then mathematically subtracts that
[39:37] Speaker 3: modeled activity from the primary optical light curve. That is
[39:40] Speaker 3: brilliant It essentially runs a complex to trending algorithm using
[39:43] Speaker 3: the NUV data as a negative filter against the optical data.
[39:47] Speaker 2: This is literally active noise cancelation technology applied to stellar astrophysics.
[39:52] Speaker 3: The photometric principles are very similar to acoustic phase cancelation. Yes,
[39:56] Speaker 3: the NUV sensor is the external microphone on your headphones
[40:00] Speaker 3: listening to the ambient noise of the airplane engine or
[40:02] Speaker 3: the heavy metal music. The computer flips the waveform of
[40:05] Speaker 3: that noise and feeds it back into the audio stream,
[40:08] Speaker 3: canceling the engine out. EVE uses the NUV sensor to
[40:12] Speaker 3: listen to the stellar flares, calculates the photometric equivalent of
[40:16] Speaker 3: the reverse waveform, and applies it to the optical data.
[40:19] Speaker 2: Imagine the feeling in the control room the first time
[40:22] Speaker 2: they run that algorithm on real data. You are staring
[40:25] Speaker 2: at this raw, unreadable graph of optical light. It looks
[40:29] Speaker 2: completely chaotic. No human eye could ever discern a pattern
[40:33] Speaker 2: in it. Just spikes a noise, and then you click
[40:35] Speaker 2: a button to execute the NUV subtraction protocol. The computer
[40:39] Speaker 2: strips away the magnetic noise, and right before your eyes,
[40:42] Speaker 2: the jagged chaotic spikes flatten out. The rolling star spot
[40:45] Speaker 2: hills smooth out into a clean baseline, and sitting perfectly
[40:48] Speaker 2: isolated in the center of the graph is a smooth, delicate,
[40:52] Speaker 2: undeniable U shaped dip.
[40:54] Speaker 3: It gives me goosebumps just thinking about it.
[40:55] Speaker 2: The hidden shadow of a newly born world revealed by
[40:58] Speaker 2: mathematically silencing its host star.
[41:00] Speaker 3: It represents a monumental leap forward in photometric analysis, and
[41:04] Speaker 3: once EDE successfully cancels the noise and reveals those hidden planets,
[41:09] Speaker 3: it can finally perform the task it was built for,
[41:12] Speaker 3: counting them, which brings us to the ultimate score card.
[41:16] Speaker 2: The moment of truth. Eve is staring at twenty thousand
[41:20] Speaker 2: young stars. The noise is canceled, the data is clean.
[41:23] Speaker 2: We are essentially running a grand cosmic experiment with two
[41:27] Speaker 2: incredibly clear divergent outcomes.
[41:29] Speaker 3: Exactly.
[41:30] Speaker 2: Let's lay out the wind lost conditions for these two
[41:32] Speaker 2: warring scientific factions. What is the expected outcome if hypothesis won.
[41:37] Speaker 2: The shrinking gas dwarf theory is the reality of our
[41:40] Speaker 2: universe if.
[41:41] Speaker 3: The evolutionary model is correct, If all protoplanets aggressively accrete
[41:44] Speaker 3: massive hydrogen envelopes and the universe routinely pumps out nothing,
[41:48] Speaker 3: but puffy gas dwarfs that haven't had time to boil
[41:51] Speaker 3: away yet. Then the twenty thousand Young Stars EVE observes
[41:54] Speaker 3: should be absolutely teeming with massive, easily detectable sub neptune.
[41:59] Speaker 3: This is a big tarts exactly because these planets are large,
[42:03] Speaker 3: they block a substantial fraction of light, making them relatively
[42:07] Speaker 3: easy to spot even against residual noise. Statistical modeling of
[42:11] Speaker 3: the EVE mission parameters predicts that if hypothesis one is right,
[42:17] Speaker 3: the telescope will detect and confirm roughly one hundred small young.
[42:22] Speaker 2: Exoplanets one hundred planets younger than fifty million years old.
[42:27] Speaker 2: That is an absolute gold mine. That single mission would
[42:30] Speaker 2: quintuple humanity's entire catalog of young planets.
[42:33] Speaker 3: It would change the field overnight.
[42:35] Speaker 2: But what happens if the data supports hypothesis too? What
[42:38] Speaker 2: if the sub neptunes aren't puffy gas dwarfs waiting to
[42:41] Speaker 2: be sunburned, but are actually those dense superioronic water worlds
[42:44] Speaker 2: that formed beyond the snow line.
[42:46] Speaker 3: If the dense water world theory is the reality, the
[42:48] Speaker 3: architecture of the young universe looks profoundly different. The super
[42:52] Speaker 3: earths form inside the snow line, and because they are
[42:54] Speaker 3: born entirely of dry rock, their physical radii are inherently small.
[42:58] Speaker 3: The sub neptunes form out side the snow line, but
[43:01] Speaker 3: because they are composed of dense, high pressure ice and
[43:04] Speaker 3: rock rather than incredibly puffy hydrogen gas, their intrinsic physical
[43:08] Speaker 3: radii are also relatively small compared to a gas dwarf.
[43:13] Speaker 2: And as we established earlier, the physical size of the
[43:15] Speaker 2: planet is the limiting factor in the transit method.
[43:18] Speaker 3: Exactly, the transit depth is proportional to the square of
[43:21] Speaker 3: the planetary radius. If a planet is physically small, dense,
[43:25] Speaker 3: and compact rather than puffy, it extended, the amount of
[43:28] Speaker 3: starlight it blocks is microscopic.
[43:31] Speaker 2: Even with the noise cancelation.
[43:32] Speaker 3: Even with a revolutionary NUV noise cancelation technology, there is
[43:36] Speaker 3: a fundamental photometric floor. EVE cannot perform miracles. If the
[43:41] Speaker 3: dense water world theory is correct, the vast majority of
[43:44] Speaker 3: the young rocky and icy planets will simply be too
[43:47] Speaker 3: small and their transit's too shallow to ever rise above
[43:50] Speaker 3: the absolute baseline noise floor of the young host star.
[43:53] Speaker 2: They will just remain hidden in the glare yes.
[43:55] Speaker 3: In this scenario, the statistical models predict a brutally low yield.
[43:59] Speaker 3: If hypothesis too is correct, EVE expects to find only
[44:02] Speaker 3: about five new young planets out of those twenty thousand.
[44:05] Speaker 2: Stars, five compared to one hundred.
[44:08] Speaker 3: It is a stunningly divergent set of expected outcomes.
[44:12] Speaker 2: It is exceedingly rare in the history of science that
[44:14] Speaker 2: you get such an unequivocally clean, unambiguous verdict. Usually scientific
[44:19] Speaker 2: debates are settled by agonizing degrees. You launch a multi
[44:23] Speaker 2: billion dollar probe to test to theory. The probe returns
[44:26] Speaker 2: data showing a subtle four percent deviation from the expected.
[44:29] Speaker 3: Norm, and then the academic community spends the next two
[44:32] Speaker 3: decades arguing in journals over statistical significance and instrumental errors.
[44:37] Speaker 2: Exactly, but this finding five planets versus finding one hundred planets.
[44:41] Speaker 2: That is a night and day verdict. There is no
[44:43] Speaker 2: gray area. If EVE launches and two years later the
[44:47] Speaker 2: team publishes a paper announcing the discovery of ninety five
[44:49] Speaker 2: sub neptunes, the debate is instantly over. The gas swarf
[44:53] Speaker 2: camp wins, the universe boils atmospheres, and the champagne is popped.
[44:57] Speaker 2: If they publish a paper saying they stared at twenty
[44:59] Speaker 2: thousand star and only found four planets. The water World
[45:02] Speaker 2: camp claims absolute victory. The snow line dictates destiny. The
[45:07] Speaker 2: debate dies on the spot.
[45:08] Speaker 3: It is a definitive, uncompromising crucible for planetary theory. However,
[45:14] Speaker 3: we must ground this discussion in the current realities of
[45:17] Speaker 3: aerospace engineering and funding. EVE is a phenomenally well designed architecture,
[45:22] Speaker 3: but as of right now it is merely a blueprint.
[45:25] Speaker 3: Ah the catch the project has been proposed, but it
[45:28] Speaker 3: is not yet fully funded and integrated into a launch manifest.
[45:31] Speaker 2: Right it's competing for resources.
[45:32] Speaker 3: Yes, EVE is designed and pitched specifically as a NASA
[45:36] Speaker 3: Small Explorer's Mission or SEPX, and understanding the philosophy behind
[45:41] Speaker 3: the sameex program is crucial to understanding the future trajectory
[45:45] Speaker 3: of astrophysics as a whole.
[45:47] Speaker 2: I know NASA has different tiers of missions, like the
[45:49] Speaker 2: flagship missions. How does a smepnex mission differ from something
[45:52] Speaker 2: like the James Webb Space Telescope.
[45:54] Speaker 3: They represent opposite ends of the philosophical spectrum of spacecraft design.
[45:58] Speaker 3: Flagship missions like gws T or the Hubble Space Telescope
[46:01] Speaker 3: before it, are designed to be general purpose jack of
[46:04] Speaker 3: all trades observatories. They cost ten billion dollars, They require
[46:07] Speaker 3: two decades of engineering and political rambling to build, and
[46:11] Speaker 3: because they cost so much, they are obligated to serve
[46:14] Speaker 3: the entire global astronomical community.
[46:16] Speaker 2: They have to do a little bit of everything exactly.
[46:18] Speaker 3: Yeah, JWST has to be capable of looking at the
[46:21] Speaker 3: atmosphereic chemistry of an exoplanet on Tuesday, the accretion disc
[46:25] Speaker 3: of a supermassive black hole on Wednesday, and the formation
[46:28] Speaker 3: of the earliest galaxies on Thursday. It is a multi tool.
[46:32] Speaker 2: It has to do everything reasonably well to justify the
[46:34] Speaker 2: price tag precisely.
[46:36] Speaker 3: A sem ex mission is the absolute antithesis of a flagship.
[46:40] Speaker 3: The small explorer's program is built on a philosophy of aggressive,
[46:44] Speaker 3: highly specialized targeting. The budget is tightly capped, usually in
[46:48] Speaker 3: the low hundreds of millions rather than billions. The development
[46:51] Speaker 3: timeline is drastically.
[46:53] Speaker 2: Compressed, so it's lean and fast, very and.
[46:55] Speaker 3: The trade off for this speed and affordability is that
[46:58] Speaker 3: assent mission is not allowed to be a jack of
[47:00] Speaker 3: all trades. It is designed from the silicon up to
[47:03] Speaker 3: answer one specific, profound question and it ignores everything else.
[47:07] Speaker 2: So EVEE fits right into that.
[47:09] Speaker 3: Eve is the ultimate embodiment of this. It does not
[47:12] Speaker 3: care about quasars, It does not care about dark matter.
[47:16] Speaker 3: It cares about pointing a multi ban photometer at twenty
[47:19] Speaker 3: two thousand young stars to count from five to one hundred.
[47:22] Speaker 2: It's a scalpel instead of a Swiss army knife, and.
[47:24] Speaker 3: That scalpel approach is gaining immense traction. The scientific community
[47:29] Speaker 3: is realizing that as our questions become more precise, like
[47:32] Speaker 3: the nature of the radius valley, we can no longer
[47:35] Speaker 3: rely on general purpose tools to provide the necessary resolution.
[47:38] Speaker 3: It makes sense if eve is adopted and flown, it
[47:42] Speaker 3: will do far more than just declare a winner in
[47:44] Speaker 3: the exoplanet debate. It will physically validate the entire methodology
[47:48] Speaker 3: of multi band photometric noise cancelation. It will provide a permanent,
[47:53] Speaker 3: proven engineering template for taming the chaotic light of young stars,
[47:57] Speaker 3: opening up the entire field of primordial planetary observation.
[48:00] Speaker 2: So, after this incredible journey into bimodal distributions, the crushing
[48:05] Speaker 2: thermodynamics of superionic water, the brutal reality of extreme ultraviolet
[48:10] Speaker 2: atmospheric stripping, and the ingenious engineering of the three sensor solution.
[48:14] Speaker 2: Let's bring the focus entirely back to you, the listener.
[48:17] Speaker 2: Good idea, Why does understanding the mechanics of a statistical
[48:21] Speaker 2: gap and a catalog of alien worlds matter? Why should
[48:24] Speaker 2: the outcome of the EVE mission change how you perceive
[48:27] Speaker 2: the night sky? Because answering this single question, whether planets
[48:31] Speaker 2: routinely have their atmospheres violently boiled away, or whether they
[48:35] Speaker 2: are born as bizarre high pressure half water half rock hybrids,
[48:40] Speaker 2: fundamentally rewrites our understanding of what a normal planet actually is.
[48:44] Speaker 3: It completely shatters the geocentric bias we have held since
[48:47] Speaker 3: the dawn of astronomy.
[48:48] Speaker 2: Exactly we all grew up studying our own solar system.
[48:51] Speaker 2: We observe the architecture of our local neighborhood, small, dry, dense,
[48:56] Speaker 2: rocky worlds close to the Sun Mercury, Venus, Earth, Mars,
[49:00] Speaker 2: and massive volatile, rich gas and ice giants far away Jupiter, Saturn, Uranus, Neptune.
[49:07] Speaker 3: That's the textbook picture.
[49:08] Speaker 2: For decades, humanity operated under the assumption that this was
[49:11] Speaker 2: the standard cosmic template. We assumed our solar system was
[49:14] Speaker 2: the blueprint for the galaxy. But the discovery of the
[49:16] Speaker 2: Radius Valley proves that the universe is doing something else entirely,
[49:19] Speaker 2: it really is, the cosmos is aggressively sorting billions of
[49:23] Speaker 2: worlds into super earths and sub neptunes, two specific classes
[49:27] Speaker 2: of planets that do not even exist in our Solar system.
[49:30] Speaker 2: We are not the cosmic standard.
[49:32] Speaker 3: We are the weirdos, which leaves us with a lingering,
[49:35] Speaker 3: deeply provocative philosophical implication to consider. Let us assume for
[49:40] Speaker 3: a moment that hypothesis to the dense water world theory
[49:43] Speaker 3: is ultimately proven correct.
[49:45] Speaker 2: Okay, let's assume that.
[49:46] Speaker 3: Let us imagine that Eve launches, cancels a noise, finds
[49:50] Speaker 3: only five young planets, and conclusively proves that the massive
[49:54] Speaker 3: population of sub neptunes sitting just beyond the Radius Valley
[49:57] Speaker 3: are indeed composed of fifty percent water by mass, forged
[50:00] Speaker 3: in the freezing depths beyond the snow line.
[50:02] Speaker 2: If that turns out to be the reality, If.
[50:04] Speaker 3: The dominant planetary manufacturing process of the universe routinely and
[50:08] Speaker 3: consistently builds worlds that are half water by mass, what
[50:12] Speaker 3: does that mean for the prevalence of water and potentially
[50:14] Speaker 3: life across the cosmos.
[50:16] Speaker 2: That is a huge question.
[50:17] Speaker 3: Humanity proudly refers to Earth as the ultimate water world,
[50:21] Speaker 3: the rare, life giving blue oasis floating in a sterile,
[50:25] Speaker 3: dry void. But if these dense sub neptunes are the
[50:28] Speaker 3: statistical norm, our perspective is entirely inverted.
[50:31] Speaker 2: We'd be the odd ones out.
[50:33] Speaker 3: We might actually be a dry, arid rock hard anomaly
[50:37] Speaker 3: in a galaxy that is literally overflowing with deep planetary
[50:41] Speaker 3: scale oceans, oceans so unimaginably deep and heavy that the
[50:45] Speaker 3: water crushes itself into glowing metallic hot ice.
[50:49] Speaker 2: That is a staggering paradigm shift.
[50:51] Speaker 3: And if the Milky Way is teeming with these incomprehensibly
[50:54] Speaker 3: deep water worlds, it forces astrobiologists to confront a terrifying question.
[50:59] Speaker 3: Does an abundance of water make the existence of extraterrestrial
[51:02] Speaker 3: life more likely because the fundamental solvent of biology is everywhere,
[51:06] Speaker 3: or does it make it drastically less likely because those crushing,
[51:09] Speaker 3: high pressure, superioric ice environments are simply too alien, too
[51:12] Speaker 3: gravitationally hostile, entirely lacking the shallow sunlit tide pools, the
[51:17] Speaker 3: exposed silicate rock, and the wet, dry chemical cycling where
[51:20] Speaker 3: we believe life on Earth first sparked into existence.
[51:23] Speaker 2: Are we the only oasis in the desert, or are
[51:26] Speaker 2: we just the only shallow puddle in a universe dominated
[51:29] Speaker 2: by bottomless, crushing oceans. That is exactly why the pursuit
[51:34] Speaker 2: of missions like Eve is so critical, because untangling the
[51:37] Speaker 2: physics of the Radius Valley doesn't just categorize dead rocks.
[51:41] Speaker 2: It establishes the physical boundaries for the search for life itself.
[51:44] Speaker 3: Exactly. It's about finding our place in the universe.
[51:47] Speaker 2: We started this conversation talking about how much human intuition
[51:50] Speaker 2: craves smooth, continuous bell curves the universe. It turns out
[51:55] Speaker 2: actively resists our attempts to put it into neat, predictable boxes.
[51:59] Speaker 2: It hides its most profound mechanical secrets behind the blazing,
[52:02] Speaker 2: chaotic glare of volatile young stars and buries them under
[52:06] Speaker 2: the crushing depths of alien oceans. But piece by piece,
[52:10] Speaker 2: algorithm by algorithm, we are building the exact tools required
[52:13] Speaker 2: to pierce that glare and read the history written in
[52:15] Speaker 2: the starlight. Keep looking up, keep questioning the unseen forces
[52:19] Speaker 2: shaping the cosmos, and we will catch you on the
[52:21] Speaker 2: next intellectual adventure,

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