# Black Holes May Be Cosmic Digestive Systems

An episode of [Bedtime Astronomy](https://invisiblenetwork.ai/podcast/1736397134), 18 Aug 2026, 29 min.

Audio: https://dts.podtrac.com/redirect.mp3/api.spreaker.com/download/episode/73310062/bholep.mp3

Black holes may behave less like bottomless pits and more like cosmic digestive systems. In this episode, we explore new observations showing that black holes eject enormous amounts of matter through powerful winds and jets, even after their feeding slows down. The discovery suggests that much of the material they capture is eventually returned to space, reshaping our understanding of how black holes influence the evolution of galaxies. 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.
[0:26] Speaker 2: Imagine dropping this massive boulder into a bottomless.
[0:30] Speaker 3: Pit, right.
[0:30] Speaker 4: You expect it to just fall silently into the dark
[0:33] Speaker 4: and you know, vanish from existence forever exactly.
[0:36] Speaker 2: But instead of that quiet disappearance, the pit suddenly violently
[0:40] Speaker 2: spits half of that boulder back out.
[0:43] Speaker 4: Just launches the shattered pieces straight back at your face
[0:45] Speaker 4: at nearly the speed of light.
[0:47] Speaker 2: Right, which completely breaks the rules of how a pit
[0:49] Speaker 2: is supposed to work. Yeah, I mean it's totally backwards. Yeah.
[0:53] Speaker 2: But well, everything you thought you knew about black holes
[0:55] Speaker 2: being the universe's ultimate unstoppable vacuum cleaners is that broken rule?
[1:01] Speaker 3: It really is.
[1:01] Speaker 4: I mean, we've been working with this very compelling but
[1:04] Speaker 4: ultimately flawed archetype for a really long time. The perfect
[1:08] Speaker 4: cosmic drain.
[1:09] Speaker 2: Yeah, the trapdoor in space exactly.
[1:11] Speaker 4: It's a neat terrifying concept. You get too close, you
[1:14] Speaker 4: cross the event horizon, and boom, you are deleted from
[1:17] Speaker 4: the universe.
[1:17] Speaker 2: Just gone right.
[1:19] Speaker 4: But gravity at that extreme scale is actually far more
[1:22] Speaker 4: chaotic and frankly, far more creative than just the simple
[1:25] Speaker 4: point of no return. We're discovering that black holes don't
[1:28] Speaker 4: just consume matter, they actively redistribute it.
[1:32] Speaker 2: So today we are taking a sledgehammer to that old
[1:35] Speaker 2: vacuum cleaner myth. We're unpacking some recent, highly detailed astronomical observations,
[1:42] Speaker 2: specifically focusing on this groundbreaking research from doctor Noel Castro Segura,
[1:47] Speaker 2: along with data pulled directly from the very large.
[1:49] Speaker 4: Telescope, and this data completely reshapes how we understand these
[1:53] Speaker 4: objects totally.
[1:54] Speaker 2: We're moving away from the bottomless pit idea and looking
[1:56] Speaker 2: at a reality where a black hole acts much more
[1:59] Speaker 2: like a highly complex, incredibly messy cosmic digestive system.
[2:04] Speaker 4: And you know, the paradigm shift here is profound. I
[2:07] Speaker 4: really want to emphasize that this is not just some
[2:10] Speaker 4: slight mathematical correction to an obscure theoretical.
[2:13] Speaker 2: Model, right, It's much bigger than that.
[2:14] Speaker 4: Huge When we observe a black hole feeding. Now we're
[2:17] Speaker 4: seeing it actively alter its surrounding environment in real.
[2:21] Speaker 2: Time, like literally watching it happen.
[2:23] Speaker 4: Yes, we're capturing the mechanical anatomy of that process on
[2:26] Speaker 4: a very granular level. It fundamentally changes our understanding of
[2:30] Speaker 4: the whole life cycle of galaxies.
[2:31] Speaker 2: Okay, so to see this in action, we're going to
[2:34] Speaker 2: look at a spectacular event from twenty twenty three. Astronomers
[2:37] Speaker 2: were watching this newly discovered black hole system, which goes
[2:40] Speaker 2: by the incredibly catchy name swift j one ten twenty
[2:43] Speaker 2: seven point eight Jute sixteen.
[2:45] Speaker 3: Thirteen rolls right off the tongue.
[2:47] Speaker 2: Oh yeah, let's just call it swift Jay's seventeen twenty
[2:50] Speaker 2: seven for our sanity. But this system gave us an
[2:54] Speaker 2: unprecedented front row seat to the sheer violence of a
[2:57] Speaker 2: feeding frenzy, and I cannot wait to get into the
[2:59] Speaker 2: mechanics this. It's fascinating because the sheer concept of the
[3:02] Speaker 2: universe's ultimate trapdoor actively blasting matter back into space. It
[3:07] Speaker 2: just hurts my brain a little bit.
[3:08] Speaker 4: I mean, it forces a total reevaluation of basic gravitational intuition.
[3:13] Speaker 4: We're so used to thinking of gravity purely as an
[3:16] Speaker 4: attractive force.
[3:17] Speaker 2: Yeah, things pull other things towards them exactly.
[3:19] Speaker 4: But when you compress enough mass into a small enough space,
[3:22] Speaker 4: that attraction creates these secondary effects that are ironically violently repulsive.
[3:27] Speaker 4: Wowsive Yeah, and swift Ja seventeen twenty seven give us
[3:32] Speaker 4: a highly detailed, basically undeniable visual record of those secondary effects.
[3:37] Speaker 4: We are essentially looking at the mechanics of a cosmic meal,
[3:40] Speaker 4: all the way from the initial intake of material to
[3:43] Speaker 4: the final incredibly powerful expulsion.
[3:45] Speaker 2: Okay, so before we talk about how a black hole
[3:47] Speaker 2: spits anything out, I feel like we have to talk
[3:50] Speaker 2: about how it gets the food in the first place, right,
[3:52] Speaker 2: the intake, Yeah, because it's not just wandering through space
[3:54] Speaker 2: gobbling up random planets like pac Man. Right. Swift Ja
[3:57] Speaker 2: seventeen twenty seven is a binary system. So we have
[4:00] Speaker 2: this black hole and it's locked in this intense gravitational
[4:03] Speaker 2: dance with a companion star.
[4:05] Speaker 4: And that proximity is what dictates absolutely everything that follows.
[4:09] Speaker 4: You have a relatively normal star, perhaps something similar in
[4:13] Speaker 4: composition to our own sun, Okay, and it's orbiting dangerously
[4:17] Speaker 4: close to a stellar mass black.
[4:19] Speaker 2: Hole, dangerously close being the operative phrase exactly.
[4:22] Speaker 4: The black Hole's gravitational pull is immense. It's so powerful
[4:25] Speaker 4: that it creates this massive tidal force stretching across the
[4:28] Speaker 4: space between them, and it's actively overpowering the companion star's
[4:33] Speaker 4: own internal gravity.
[4:34] Speaker 2: So it's literally peeling the outer layers of the star
[4:37] Speaker 2: off like an onion.
[4:38] Speaker 3: A very hot, gaseous onion.
[4:40] Speaker 2: Yet that is such a wild visual it is.
[4:43] Speaker 4: The outer envelope of the companion Star actually gets deformed.
[4:46] Speaker 4: It's stretched into this tear drop shape that points directly toward.
[4:50] Speaker 3: The black hole.
[4:51] Speaker 2: Wow.
[4:52] Speaker 4: Yeah, And the gas at the tip of that tear
[4:54] Speaker 4: drop reaches a critical point where the gravitational pull of
[4:57] Speaker 4: the black hole exactly equals the pole of the star, like.
[5:00] Speaker 2: A tug of war that's perfectly tied, right.
[5:03] Speaker 4: But once the gas crosses that threshold, the tie is broken.
[5:07] Speaker 4: It belongs to the black hole. It just begins to
[5:09] Speaker 4: free fall through the vacuum of space.
[5:11] Speaker 2: Okay. And in twenty twenty three, this process suddenly hit
[5:15] Speaker 2: a breaking point, right, Yeah, Swift j seventeen to twenty seven,
[5:18] Speaker 2: just erupt it.
[5:19] Speaker 3: That was a massive event.
[5:20] Speaker 2: Yeah. It went from being essentially this dark, quiet patch
[5:24] Speaker 2: of sky to suddenly becoming one of the absolute brightest
[5:27] Speaker 2: X ray sources we could see anywhere, just a massive,
[5:30] Speaker 2: violent flare.
[5:30] Speaker 4: Up, truly blinding in the extra spectrum.
[5:33] Speaker 2: But okay, here is where the visuals get a bit
[5:35] Speaker 2: tricky for me, and I want to unpack this. If
[5:38] Speaker 2: a black hole is completely black like by definition, because
[5:42] Speaker 2: it's gravity traps all light, how does it suddenly become
[5:46] Speaker 2: a blinding source of X rays.
[5:48] Speaker 3: That's a great question.
[5:49] Speaker 2: It feels like a total contradiction. Yeah, you know, it
[5:52] Speaker 2: can't be the black hole itself that is shining.
[5:54] Speaker 3: No, it isn't.
[5:55] Speaker 4: You really have to separate the black hole, which is
[5:57] Speaker 4: the actual singularity and its event, from the environment immediately
[6:02] Speaker 4: surrounding it. So the light is not coming from inside
[6:07] Speaker 4: the house, so to speak. It's coming from the front porch.
[6:10] Speaker 4: When that gas is stripped away from the companion star,
[6:13] Speaker 4: it does not fall straight down into the black hole.
[6:15] Speaker 2: Because everything in space is moving right now. The star
[6:17] Speaker 2: is orbiting the black hole, so the gas it sheds
[6:20] Speaker 2: already has sideways momentum.
[6:21] Speaker 4: Precisely, it has orbital momentum, so instead of a straight
[6:24] Speaker 4: vertical plunge, the gas spirals inward it forms this vast,
[6:29] Speaker 4: flattened structure known as an accretion disk.
[6:32] Speaker 2: Okay, an accretion disk.
[6:33] Speaker 4: Yeah, I think of water swirling around a drain, but
[6:35] Speaker 4: you know, moving at a significant fraction of the speed
[6:38] Speaker 4: of light.
[6:38] Speaker 2: See. I picture it more like a cosmic plender running
[6:41] Speaker 2: on the highest possible setting.
[6:42] Speaker 3: Oh I like that.
[6:43] Speaker 2: Yeah, you have all these ingredients, this stellar gas being
[6:46] Speaker 2: dumped into the bowl. But because it's swirling inwards so
[6:49] Speaker 2: incredibly fast, the particles of gas are constantly smashing into
[6:53] Speaker 2: one another.
[6:53] Speaker 3: Exactly. The friction is immense, right, It's.
[6:56] Speaker 2: The friction of those ingredients rubbing together inside the blender
[7:00] Speaker 2: creates the heat long before the material ever actually reaches
[7:03] Speaker 2: the blades in the center.
[7:04] Speaker 4: The blender analogy is an excellent way to conceptualize the
[7:08] Speaker 4: thermodynamics at play here. The extreme physics of the superheated
[7:13] Speaker 4: disc are honestly difficult to overstate.
[7:16] Speaker 2: Like how extreme are we talking?
[7:17] Speaker 4: Well, we are not talking about a warm, glowing fire.
[7:22] Speaker 4: The friction and the gravitational compression within that spiraling disc
[7:26] Speaker 4: are so intense that the gas is literally stripped of
[7:29] Speaker 4: its electrons. Whoa, Yeah, it ceases to be normal gas
[7:32] Speaker 4: and becomes.
[7:33] Speaker 2: A plasma, which means it's incredibly hot like numbers wise,
[7:36] Speaker 2: how hot is that?
[7:38] Speaker 4: Millions of degrees millions? The inner edge of that accretion disk,
[7:43] Speaker 4: just before the matter crosses the event horizon, reaches temperatures
[7:47] Speaker 4: that would make the core of our sun look tepid.
[7:50] Speaker 2: That is just I can't even fathom that.
[7:52] Speaker 3: It's mind boggling.
[7:53] Speaker 4: And when matter gets that hot, it radiates massive amounts
[7:58] Speaker 4: of energy, predominantly in the high energy spectrum.
[8:01] Speaker 2: Of X rays. Ah okay, so that is what lit
[8:04] Speaker 2: up our detectors in twenty twenty three.
[8:05] Speaker 3: Exactly.
[8:06] Speaker 4: We were not seeing the black hole. We were seeing
[8:09] Speaker 4: the catastrophic friction of the meal being prepared.
[8:13] Speaker 2: The meal being prepared. I love that. And this wasn't
[8:15] Speaker 2: just like a quick flash that astronomers noticed after the fact, right, No,
[8:18] Speaker 2: not at all. They actually tracked this feeding process as
[8:21] Speaker 2: it happened in incredible detail using the European Southern Observatory's
[8:26] Speaker 2: very large telescope, the VLT.
[8:28] Speaker 4: And you know, the involvement of the VLT is really
[8:30] Speaker 4: what elevated this event from a routine observation to a
[8:33] Speaker 4: massive breakthrough. Also well, historically, monitoring these black hole outbursts
[8:38] Speaker 4: is a game of catchup. Telescopes sweep the sky, they
[8:41] Speaker 4: notice a sudden spike and X rays, and by the
[8:43] Speaker 4: time we actually point our most powerful optical instruments at
[8:46] Speaker 4: the source, it's over.
[8:47] Speaker 2: Basically, we're only catching the aftermath, or perhaps just an
[8:51] Speaker 2: isolated snapshot of the peak if we're lucky.
[8:54] Speaker 4: It's like trying to piece together the plot of an
[8:56] Speaker 4: entire movie by looking at three blurry polaroids scattered on
[8:59] Speaker 4: a table.
[9:00] Speaker 2: A very apt comparison. You missed the progression. But with
[9:03] Speaker 2: swift j seventeen twenty seven, the astronomical community coordinated with
[9:08] Speaker 2: remarkable speed.
[9:09] Speaker 3: That's awesome.
[9:10] Speaker 2: It was the VLT in Chile, which is one of
[9:13] Speaker 2: the most advanced optical and near infrared telescopes on the
[9:17] Speaker 2: entire planet, was able to compile an extraordinarily detailed, high
[9:22] Speaker 2: quality record of the whole event, so they basically got
[9:24] Speaker 2: the whole movie this time exactly. They watched the accretion
[9:27] Speaker 2: disk evolve. They tracked the shifting temperatures, the change in
[9:31] Speaker 2: velocities of the gas, and the varying light outputs across
[9:34] Speaker 2: multiple distinct stages of the outburst.
[9:36] Speaker 4: Man, let's just pause and visualize the sheer, terrifying scale
[9:41] Speaker 4: of this for a moment.
[9:42] Speaker 2: It's worth taking a moment for absolutely. Imagine standing on
[9:45] Speaker 2: a hypothetical planet a safe distance away. You have a star,
[9:48] Speaker 2: a massive boiling sphere of plasma, and it is being
[9:51] Speaker 2: agonizingly siphoned off. This river of material is being dragged
[9:56] Speaker 2: across millions of miles of empty space, wrapping around this
[10:00] Speaker 2: invisible point of infinite.
[10:02] Speaker 4: Darkness, beautifully terrifying, and.
[10:04] Speaker 2: It's been so violently that it outshines entire galaxies and
[10:08] Speaker 2: X ray vision. It's this unimaginably destructive force. But when
[10:12] Speaker 2: you describe the physics, it's also functioning like a beautifully
[10:16] Speaker 2: complex engine.
[10:17] Speaker 4: You know, an engine is the perfect mechanical framework for this,
[10:20] Speaker 4: really absolutely, because any functional engine requires moving parts, It
[10:23] Speaker 4: requires an intake of fuel, a combustion process, and critically
[10:27] Speaker 4: an exhaust system.
[10:28] Speaker 2: The exhaust. Okay, this is where the story of Swift j.
[10:31] Speaker 2: Seventeen twenty seven completely pivots doesly does, because we have
[10:34] Speaker 2: this vivid image of this blinding, superheated disc of stellar
[10:37] Speaker 2: material swirling inward, preparing to be completely devoured by the
[10:41] Speaker 2: event horizon an ultimate meal. Right, But the massive surprise
[10:44] Speaker 2: in the VLT data. The real twist here is that
[10:47] Speaker 2: a huge portion of that meal never actually goes down
[10:50] Speaker 2: the drain.
[10:51] Speaker 4: No, and the data revealed something that directly contradicts that
[10:55] Speaker 4: whole vacuum cleaner assumption we talked about earlier.
[10:57] Speaker 2: Okay, So what actually happens.
[11:00] Speaker 4: Paneous to this immense volume of matter spiraling inward? The
[11:03] Speaker 4: black hole began launching incredibly powerful jets and winds, physically
[11:08] Speaker 4: throwing material back outward into interstellar space.
[11:12] Speaker 2: This is the part that just shatters the old myths
[11:14] Speaker 2: for me. This isn't a pristine, efficient machine vacuuming up dust.
[11:18] Speaker 3: Not even close.
[11:19] Speaker 2: It is far more like a messy toddler sitting in
[11:23] Speaker 2: a high chair eating a bowl of spaghetti. Half of
[11:26] Speaker 2: the pasta makes it into the mouth, but the other
[11:28] Speaker 2: half gets violently thrown across the kitchen in every possible direction.
[11:32] Speaker 4: While doctor Noel castro Segura prefers the term cosmic digestive system,
[11:37] Speaker 4: I have to admit the messi toddler analogy captures the
[11:40] Speaker 4: chaotic mechanics perfectly.
[11:42] Speaker 2: It just makes so much sense it does.
[11:44] Speaker 4: Doctor Castro Segura highlighted a crucial misconception in his research.
[11:48] Speaker 4: People assume black holes just swallow everything indiscriminately, but this
[11:52] Speaker 4: real time observation proved that the system processes the matter.
[11:55] Speaker 2: And a staggering amount of that process material is expelled. Again,
[11:59] Speaker 2: it's act when we say a staggering amount, though we
[12:02] Speaker 2: aren't just talking about a few stray particles of dust
[12:05] Speaker 2: escaping the gravitational pull. Right like how much of the
[12:07] Speaker 2: star's gas is actually being thrown at the walls.
[12:10] Speaker 4: The amount of material blasted back out into the cosmos
[12:13] Speaker 4: is comparable to the amount the black hole actually consumes.
[12:17] Speaker 2: Wait comparable? Are you saying? It's nearly a one to
[12:20] Speaker 2: one ratio of eating to throwing.
[12:22] Speaker 4: Food away, depending on the specific stage of the outburst.
[12:25] Speaker 2: Yes, that is insane.
[12:26] Speaker 4: It is an extraordinarily inefficient consumption process. But to understand
[12:31] Speaker 4: why it throws the food, we really need to unpack
[12:34] Speaker 4: that cosmic digestive system concept.
[12:37] Speaker 2: Because digestion implies a transformative process.
[12:40] Speaker 4: Precisely, the black hole is an active transformer of matter.
[12:44] Speaker 4: The VLT data revealed a direct, measurable causality between the
[12:48] Speaker 4: changes happening in that inward swirling feeding disk and the
[12:52] Speaker 4: launching of the outward jets.
[12:53] Speaker 2: So the act of the gas falling inward is what
[12:55] Speaker 2: physically causes the other gas to be shot outward. How
[12:58] Speaker 2: does that even work? Gravity is pulling it in. What
[13:01] Speaker 2: force is strong enough to reverse that pole and shoot
[13:05] Speaker 2: it away at nearly light speed?
[13:06] Speaker 3: Magnetic fields?
[13:07] Speaker 2: Magnetic fields?
[13:08] Speaker 4: Yeah, and to understand this, we have to look closely
[13:11] Speaker 4: at the nature of the plasma in the accretion disc.
[13:14] Speaker 4: Because the gas is superheated into a plasma, as we discussed,
[13:18] Speaker 4: it is highly electrically charged.
[13:20] Speaker 2: Okay, right, Electrons are stripped.
[13:21] Speaker 4: Away exactly, and moving electrical charges generate magnetic fields.
[13:26] Speaker 2: Okay, So the accretion disc is basically a giant spinning electromagnet.
[13:30] Speaker 3: Yes, exactly.
[13:32] Speaker 4: Now imagine twisting a rubber band attached to the propeller
[13:35] Speaker 4: of a toy airplane.
[13:37] Speaker 2: Okay, I'm picturing it.
[13:38] Speaker 4: As the gas in the accretion disc spirals closer and
[13:41] Speaker 4: closer to the black hole, it is moving faster and faster.
[13:45] Speaker 4: This rapid rotation grabs those magnetic field lines and begins
[13:48] Speaker 4: to twist them, winding them up incredibly tight around the
[13:52] Speaker 4: rotational axis of the black hole.
[13:53] Speaker 2: So the tension is just building and building as the
[13:55] Speaker 2: disk spins.
[13:56] Speaker 4: Exactly it winds tighter and tighter until the magnetic tis
[14:00] Speaker 4: reaches a critical threshold where it simply can no longer hold.
[14:03] Speaker 2: And then what it snaps?
[14:05] Speaker 4: Yes, the twisted field lines violently snap and reconnect. When
[14:10] Speaker 4: that rubber band snaps, it releases a monumental amount of
[14:13] Speaker 4: stored magnetic energy.
[14:15] Speaker 2: Wow.
[14:15] Speaker 4: And this snapping physically grabs a massive portion of the
[14:19] Speaker 4: infalling gas away from the event horizon, accelerates it along
[14:23] Speaker 4: the newly aligned magnetic poles and blasts it out as narrow,
[14:26] Speaker 4: highly focused jets.
[14:28] Speaker 2: That is unbelievable. It is literally using the gravitational energy
[14:32] Speaker 2: of the falling matter to build a magnetic cannon just
[14:35] Speaker 2: to shoot the rest of the matter away.
[14:36] Speaker 4: That is the exact mechanism. The intake of fuel directly
[14:39] Speaker 4: powers the exhaust. It completely replaces the archetype of the
[14:43] Speaker 4: unstoppable glutton with a dynamic, self regulating engine.
[14:46] Speaker 2: That is deeply fascinating. It's a self regulating system totally.
[14:49] Speaker 2: But the timeline of this exhaust system is where things
[14:52] Speaker 2: get truly bizarre to me. Uh Yes, the timeline, because
[14:56] Speaker 2: logic would dictate that this violent expulsion the magnetic cannons
[15:00] Speaker 2: a Toddler throwing the spaghetti. What only happen during the
[15:02] Speaker 2: absolute peak of the frenzy.
[15:04] Speaker 4: That's what you would intuitively think, yeah.
[15:06] Speaker 2: Like when the cosmic blender is running at maximum speed
[15:09] Speaker 2: and those X rays are blindingly bright. But the biggest
[15:13] Speaker 2: shock of the entire Swift j seventeen twenty seven event
[15:17] Speaker 2: happened after the lights essentially went out.
[15:19] Speaker 4: The grand finale of this outburst provided the most critical
[15:22] Speaker 4: piece of the whole puzzle. It really forced us to
[15:25] Speaker 4: confront our own observational biases.
[15:27] Speaker 2: Let's walk through that finale because it's wild. So the
[15:30] Speaker 2: astronomers are watching this system, the initial feeding frenzy starts
[15:34] Speaker 2: to die down, the companion star isn't being siphoned quite
[15:37] Speaker 2: as aggressively, de accretion disk starts to cool off, and
[15:41] Speaker 2: the overall system becomes extremely faint. I mean, the data
[15:45] Speaker 2: showed that it dimmed to roughly one hundredth of its
[15:48] Speaker 2: peak X ray activity.
[15:49] Speaker 3: Just one percent of its maximum brightness.
[15:51] Speaker 2: Right so to our X ray telescopes, it looked like
[15:54] Speaker 2: the dramatic event was basically over. The black hole was satiated,
[15:58] Speaker 2: the engine was cowering down, and the system was returning
[16:01] Speaker 2: to a state of dormancy.
[16:02] Speaker 4: But even in this incredibly faint quiet state, the researchers
[16:05] Speaker 4: detected something massive. They discovered that dense, relatively cool gas
[16:11] Speaker 4: was still being blown away from the accretion disk in
[16:13] Speaker 4: the form of incredibly powerful, sustained winds.
[16:17] Speaker 2: Wait, winds. Not the jets from the poles.
[16:19] Speaker 4: No, not the narrow light speed jets from the poles.
[16:22] Speaker 4: This was a broader, massive outflow of material.
[16:25] Speaker 2: Okay, I am going to throw a flag on the
[16:27] Speaker 2: play here because this physics problem really stumped me.
[16:30] Speaker 3: Oh, let's hear it.
[16:32] Speaker 2: If the X ray brightness which we established is the
[16:35] Speaker 2: direct result of the friction, and the energy of the
[16:37] Speaker 2: feeding frenzy drops to just one percent of its peak,
[16:41] Speaker 2: how does the black hole still have the juice to
[16:44] Speaker 2: push massive amounts of dense gas into space.
[16:46] Speaker 3: It's a fantastic question.
[16:48] Speaker 2: Like, if the intake power is the exhaust, doesn't the
[16:51] Speaker 2: engine need a roaring fire to keep pushing that much
[16:54] Speaker 2: heavy material? How is it generating massive winds when the
[16:57] Speaker 2: X rays suggest the engine is essentially turned off.
[17:00] Speaker 4: That apparent contradiction is precisely what makes this paper so revolutionary.
[17:04] Speaker 4: It forces astronomers to completely separate radiant energy from mechanical energy.
[17:09] Speaker 2: Okay, you're losing me. What is the difference in this context?
[17:12] Speaker 4: Well, we have historically relied heavily on radiant energy, the
[17:16] Speaker 4: X rays, the visible light, the things our telescopes can
[17:19] Speaker 4: easily see to tell us how active a black hole is.
[17:22] Speaker 2: Sure, bright means active exactly.
[17:24] Speaker 4: The intuitive assumption is that bright equals powerful and dim
[17:28] Speaker 4: equals weak. But this late stage massive expulsion proves that
[17:33] Speaker 4: the mechanical power of the system, the sheer kinetic force
[17:36] Speaker 4: pushing matter around, operates on a much longer, much more
[17:40] Speaker 4: resilient timeline than the radiant output.
[17:43] Speaker 2: Oh I see, are we talking about momentum partially? Yeah,
[17:46] Speaker 2: like a spinning top. Even if you stop actively twisting
[17:49] Speaker 2: a toy top, which would be the radiant energy dying down,
[17:52] Speaker 2: it doesn't just stop dead. It keeps spinning for a
[17:55] Speaker 2: long time, purely because of the momentum it built up.
[17:58] Speaker 3: That is a brilliant analogy.
[17:59] Speaker 4: Yeah, we are absolutely talking about residual angular momentum and
[18:03] Speaker 4: latent magnetic tension. The radiant emission, the glowing friction of
[18:06] Speaker 4: the plasma drops rapidly as the density of the inner
[18:09] Speaker 4: disk decreases.
[18:10] Speaker 2: There's less stuff rubbing together, right, But.
[18:12] Speaker 4: The mechanical system, the broader outer accretion disk, still retains
[18:17] Speaker 4: an enormous amount of kinetic energy and magnetic structure.
[18:20] Speaker 2: So it's still moving even if it's not glowing exactly.
[18:24] Speaker 4: Kyle Solomon's, a doctoral researcher who was deeply involved in
[18:27] Speaker 4: analyzing this data, pointed this out beautifully. He noted that
[18:30] Speaker 4: as observers, we naturally gravitate toward the dramatic bright fireworks
[18:34] Speaker 4: at the start of an outburst.
[18:36] Speaker 2: Sure as human nature to look at the brightest light.
[18:38] Speaker 4: But he argues, we're basically missing the point by looking
[18:40] Speaker 4: away when it gets dim.
[18:41] Speaker 2: Wow. Yeah.
[18:43] Speaker 4: Solomon's emphasizes that the finale can be just as intense
[18:46] Speaker 4: as the beginning, just in a completely different physical manifestation.
[18:50] Speaker 4: The energy shifts from producing blinding light to producing heavy
[18:55] Speaker 4: mechanical winds.
[18:56] Speaker 2: So even though the blender isn't glowing bright enough for
[18:58] Speaker 2: us to see the friction anymore, the blades are still
[19:00] Speaker 2: spinning fast enough to generate a hurricane inside the bowl.
[19:03] Speaker 4: A cosmic hurricane of dense gas. Yes, and this discovery
[19:07] Speaker 4: highlights the sheer resilience of these outflows. It fundamentally rewrites
[19:12] Speaker 4: our classification of black hole states in what way it
[19:15] Speaker 4: means that even a quiet or dim black hole, one
[19:19] Speaker 4: that appears completely dormant in X ray surveys, might still
[19:22] Speaker 4: be an active, forceful presence in space.
[19:25] Speaker 2: That's kind of creepy.
[19:26] Speaker 4: It is it is still exerting a massive physical influence,
[19:30] Speaker 4: physically bulldozing its surroundings with dense winds long after the
[19:35] Speaker 4: visible fireworks have faded into the background.
[19:37] Speaker 2: There is something almost haunting about that visual definiel, this invisible,
[19:42] Speaker 2: silent giant just sitting in the dark of space, still
[19:46] Speaker 2: exhaling this massive, heavy cosmic wind.
[19:50] Speaker 3: Yeah.
[19:50] Speaker 2: And we've just been completely ignoring this late stage activity
[19:55] Speaker 2: for decades, simply because we are only tuning our instruments
[19:58] Speaker 2: to look for the bright flashes.
[19:59] Speaker 4: And that specific oversight has skewed our mathematical models of
[20:02] Speaker 4: the universe for a long time.
[20:04] Speaker 3: Really, Yes, which.
[20:05] Speaker 4: Brings us to the most vital part of this discussion,
[20:08] Speaker 4: the broader implications, Right.
[20:09] Speaker 2: Because astronomy is never just about one isolated object. It's
[20:12] Speaker 2: always about the ripple effect always.
[20:14] Speaker 4: We have established has Swift j seventeen twenty seven fed
[20:17] Speaker 4: how it threw a massive percentage of that matter outward
[20:20] Speaker 4: during the blinding peak, and how it continued to mechanically
[20:23] Speaker 4: exhale dense gas even as it faded to black. Right
[20:26] Speaker 4: now we must zoom out and look at the whole chessboard.
[20:29] Speaker 2: So what does this single messy eater imply for the
[20:32] Speaker 2: grander cosmic ecosystem. I know the researcher is going to
[20:36] Speaker 2: term for this behavior that I think perfectly frames the discussion.
[20:39] Speaker 2: They stated that this data proves black holes are highly
[20:43] Speaker 2: inefficient eaters.
[20:44] Speaker 3: It is the perfect scientific descriptor.
[20:47] Speaker 2: It really is.
[20:47] Speaker 4: Because they continue shedding material long after their largest outbursts
[20:51] Speaker 4: have visually concluded, and because they expel an amount of
[20:55] Speaker 4: mass that is roughly comparable to what they successfully consume,
[20:59] Speaker 4: they are terribly inefficient at actually gaining weight from their meals.
[21:02] Speaker 2: Right they're on a cosmic diet pretty much.
[21:05] Speaker 4: A highly significant fraction of the stellar material that gets
[21:08] Speaker 4: permanently drawn away from the companion star never crosses the
[21:12] Speaker 4: event horizon.
[21:13] Speaker 2: So if you are listening to this right now, you
[21:15] Speaker 2: might be asking yourself, Okay, this is a really cool
[21:17] Speaker 2: story about a star millions of light years away, But
[21:19] Speaker 2: why should I care if a black hole is an
[21:21] Speaker 2: inefficient eater. How does this affect anything else?
[21:24] Speaker 3: It's a fair question.
[21:25] Speaker 2: Let's connect the dots, you me, the Earth, the cup
[21:29] Speaker 2: of coffee on your desk. Everything we interact with is
[21:32] Speaker 2: made of ordinary matter atoms. For a century, popular culture
[21:37] Speaker 2: and even introductory physics taught us to think of black
[21:41] Speaker 2: holes as cosmic trash compactors. They lock matter away permanently.
[21:46] Speaker 2: They literally remove atoms from the universal game.
[21:49] Speaker 3: Board, right, the deletion of matter.
[21:51] Speaker 2: But if they are actually inefficient eaters, if they're cosmic recyclers,
[21:56] Speaker 2: it means they are actively seeding their host galaxies with
[21:59] Speaker 2: heavy lead processed, energized material.
[22:02] Speaker 4: Exactly, they are taking raw, relatively dormant gas from a
[22:06] Speaker 4: companion star, pulling it into these extreme environments, superheating it,
[22:11] Speaker 4: magnetizing it, altering its elemental structure through.
[22:14] Speaker 2: Extreme friction, all the blender stuff.
[22:16] Speaker 4: Right, and then blasting it back out into the interstellar
[22:19] Speaker 4: media at tremendous velocities.
[22:20] Speaker 2: They're basically refining the raw material and shipping it back out. Yes,
[22:24] Speaker 2: So how does that change the way astronomers look at
[22:27] Speaker 2: a galaxy as a whole?
[22:28] Speaker 4: Well, Doctor Kestro Sigura pointed out that this explicitly changes
[22:30] Speaker 4: our baseline understanding of how binary star systems evolve.
[22:34] Speaker 2: For starters.
[22:34] Speaker 4: Okay, so previously, when astronomers ran computer models of a
[22:38] Speaker 4: system containing a star and a black hole, they relied
[22:42] Speaker 4: on a principle of clean transfer. They assumed that the
[22:45] Speaker 4: mass leaving the star was entirely accreted by the black hole.
[22:49] Speaker 2: Like object to A loses ten pounds, object B gains
[22:52] Speaker 2: ten pounds simple.
[22:53] Speaker 4: Math, exactly a clean closed system. But if mass isn't
[22:58] Speaker 4: just transferring, if a to fifty percent of it is
[23:01] Speaker 4: being violently relocated across the interstellar medium through jets and winds,
[23:06] Speaker 4: then the gravitational dynamics of that entire binary system evolve
[23:09] Speaker 4: completely differently than our classical models predicted.
[23:12] Speaker 2: That makes total sense, because the black hole isn't getting
[23:15] Speaker 2: as heavy as we thought.
[23:16] Speaker 4: Right, the black hole does not grow its mass nearly
[23:19] Speaker 4: as fast as we assumed, which means the orbital distance
[23:22] Speaker 4: between the star and the black hole changes at a
[23:24] Speaker 4: different rate. The life span of the companion's star is altered.
[23:28] Speaker 4: Everything shifts.
[23:29] Speaker 2: Wow, and all that expelled gas, those highly energized winds
[23:33] Speaker 2: and jets, they don't just fly through empty space forever right, No,
[23:36] Speaker 2: they don't, because space isn't entirely empty. They have to
[23:40] Speaker 2: eventually slam into something.
[23:41] Speaker 3: Yes, they do.
[23:42] Speaker 4: They slam into the interstellar medium, the vast, sprawling clouds
[23:46] Speaker 4: of cold gas and dust that drift between star systems.
[23:50] Speaker 4: And when a jet of plasma moving at a fraction
[23:53] Speaker 4: of the speed of light or a massive dense wind
[23:55] Speaker 4: carrying the momentum of a star impacts those cold clouds,
[23:59] Speaker 4: it creates color losshole shockwaves.
[24:01] Speaker 2: Like a sonic boom moving through.
[24:02] Speaker 4: A cloud of dust precisely, and these shockwaves can have
[24:05] Speaker 4: two wildly different but equally crucial effects on the galaxy.
[24:10] Speaker 2: Okay, what's the first one.
[24:11] Speaker 4: On one hand, the shockwave can compress a loose cloud
[24:14] Speaker 4: of cold gas. It forces the molecules so close together
[24:17] Speaker 4: that their own gravity takes over. The cloud collapses, and
[24:21] Speaker 4: it triggers the birth of an entirely new star system.
[24:24] Speaker 2: Wait really, yes, so a black hole violently spinning out
[24:27] Speaker 2: of these food can actually be the spark that creates
[24:29] Speaker 2: a new star.
[24:30] Speaker 4: It is a profound catalyst for stellar nurseries.
[24:34] Speaker 2: That is incredible.
[24:35] Speaker 3: It is.
[24:35] Speaker 4: But on the other hand, if the outflow is violent enough,
[24:38] Speaker 4: or if the galaxy is small enough, these black hole
[24:41] Speaker 4: winds can hit the interstellar gas with such devastating force
[24:45] Speaker 4: that they physically blow the gas right out of the galaxy,
[24:48] Speaker 4: dissipating it into the intergalactic void.
[24:51] Speaker 2: Ah wow Yeah.
[24:52] Speaker 4: And without that cold gas, the galaxy can no longer
[24:55] Speaker 4: form new stars. The black hole essentially sterilizes its own neighborhood.
[25:00] Speaker 2: Is just it's a lot to wrap your head around.
[25:03] Speaker 2: They have the power to ignite new life and the
[25:05] Speaker 2: power to completely shut down the growth of an entire galaxy.
[25:09] Speaker 3: Exactly.
[25:09] Speaker 4: They aren't just these passive endpoints of destruction waiting in
[25:12] Speaker 4: the dark. They are active, aggressive arctects of their environment.
[25:16] Speaker 2: That is the philosophical shift we really must embrace. The
[25:19] Speaker 2: beauty of observing this cosmic digestive system is that it
[25:22] Speaker 2: paints the black hole not as an isolated monster sitting
[25:25] Speaker 2: in the dark, but as a vital, interacting, regulating organ
[25:29] Speaker 2: within the anatomy of a galaxy.
[25:31] Speaker 3: A perfect way to phrase it.
[25:32] Speaker 2: By drawing gas inward and returning a substantial portion of
[25:36] Speaker 2: it through these powerful outflows, they are regulating the mass
[25:39] Speaker 2: and the star forming potential of their host galaxies. They
[25:43] Speaker 2: are deeply mechanically connected to the life cycle of every
[25:46] Speaker 2: star around them.
[25:48] Speaker 3: It completely flips the narrative.
[25:50] Speaker 2: The vacuum cleaner metaphor is just dead and buried.
[25:52] Speaker 3: At this point, thoroughly debunked.
[25:53] Speaker 2: So just to recap this incredible journey we have been
[25:57] Speaker 2: on today, we started by looking at a massive of
[26:00] Speaker 2: blinding X ray eruption in twenty twenty three from the
[26:03] Speaker 2: binary system swift j seventeen twenty seven. We looked closely
[26:08] Speaker 2: at the superheated accretion disk millions of degrees hot, and
[26:11] Speaker 2: realized that instead of a clean, silent drain, it was
[26:14] Speaker 2: acting like a messy cosmic toddler throwing its pasta exactly,
[26:18] Speaker 2: it was twisting magnetic fields to use the energy of
[26:21] Speaker 2: its own meal to build a cannon, throwing powerful jets
[26:23] Speaker 2: of matter back out into space. Yes, then we saw
[26:26] Speaker 2: that even when the lights went out and the radiant
[26:28] Speaker 2: X ray energy dropped to a tiny fraction of a percent,
[26:31] Speaker 2: the black hole was still utilizing residual mechanical momentum to
[26:35] Speaker 2: generate massive, heavy winds of dense gas in the absolute dark.
[26:39] Speaker 4: Which is honestly a powerful testament to the fact that
[26:42] Speaker 4: in astrophysics, the things we cannot easily see. The dark
[26:46] Speaker 4: mechanical winds, the invisible magnetic tension are often just as crucial,
[26:51] Speaker 4: if not more so, than the bright, radiant fireworks that
[26:54] Speaker 4: initially catch our attention.
[26:55] Speaker 2: It's a great reminder.
[26:56] Speaker 4: It reminds us that there is always more depth to uncover,
[27:00] Speaker 4: and that our initial assumptions, no matter how cleanly they
[27:02] Speaker 4: fit into a textbook, must always be subject to the
[27:05] Speaker 4: rigorous scrutiny of new observation.
[27:07] Speaker 2: It really is the ultimate cosmic recycling program. Yeah, and
[27:11] Speaker 2: it just makes the universe feel so much more connected,
[27:13] Speaker 2: so much more dynamic, and honestly a whole lot messier
[27:16] Speaker 2: than we ever gave it credit for.
[27:18] Speaker 4: It is wonderfully messy, and you know, it leaves us
[27:20] Speaker 4: with a rather profound physical concept to consider. Well, we
[27:25] Speaker 4: know that these black holes have spent billions of years
[27:27] Speaker 4: operating as these incredibly inefficient eaters. They have spent eons
[27:32] Speaker 4: stripping stars, superheating the stolen gas and blinding accretion disks,
[27:36] Speaker 4: magnetically processing it, and then violently spitting immense amounts of
[27:40] Speaker 4: that transformed matter back out into the cosmos through these
[27:42] Speaker 4: massive winds.
[27:44] Speaker 2: Okay, I see where you go?
[27:45] Speaker 4: If they have been seating the galaxies with this recycled
[27:48] Speaker 4: material since the dawn of the universe. It raises a
[27:52] Speaker 4: deeply personal question.
[27:53] Speaker 2: Let's hear it.
[27:54] Speaker 4: How much of the ordinary matter floating in our solar
[27:57] Speaker 4: system today, perhaps even the very car atoms that make
[28:01] Speaker 4: up the chair you are sitting on, or the oxygen
[28:03] Speaker 4: you are breathing right now, how much of it once
[28:06] Speaker 4: swirled on the very precipice of a black hole?
[28:09] Speaker 2: Wow?
[28:09] Speaker 4: How much of your immediate environment was once bathed in
[28:12] Speaker 4: the blinding X rays of an accretion disc hanging on
[28:15] Speaker 4: the edge of the event horizon, only to be rejected
[28:18] Speaker 4: at the last possible second, blasted back out into the
[28:21] Speaker 4: void to eventually wander through space and become you.
[28:25] Speaker 2: Now, that is a thought that will keep you awake
[28:27] Speaker 2: at night, The idea that we might literally be walking
[28:30] Speaker 2: talking collections of recycled black hole leftovers.
[28:34] Speaker 4: It's entirely possible.
[28:35] Speaker 2: We aren't just made of star stuff. We might be
[28:37] Speaker 2: made of the stuff the black hole decided to spit out.
[28:41] Speaker 2: That is incredible. Well, thank you all so much for
[28:44] Speaker 2: joining us on this amazing journey today. We love pulling
[28:47] Speaker 2: apart these cosmic mysteries with you tearing down the old
[28:50] Speaker 2: myths and seeing what the real mechanics of the universe
[28:53] Speaker 2: actually look like.
[28:53] Speaker 3: It's been a plast We absolutely.
[28:55] Speaker 2: Cannot wait to see what wild reality is the Cosmos
[28:58] Speaker 2: throws at us next. Until then, keep looking up and
[29:02] Speaker 2: keep questioning absolutely everything you think you know.

Shows are listed from Apple Podcasts' charts and directory, and Podcast Index where it is used. Every show and episode belongs to its publisher and plays from the publisher's own feed; this site hosts none of them.