# \[Interview+\] How Much Gravity Is Too Much To Escape A Planet?

An episode of [Universe Today Podcast](https://invisiblenetwork.ai/podcast/794058155), 26 Aug 2026, 42 min.

Audio: https://c10.patreonusercontent.com/4/patreon-media/p/post/166389430/55ec2fd44a7848338abfdc6c2967c42f/eyJhIjoxLCJpc19hdWRpbyI6MSwicCI6MX0%3D/1.m4a?token-hash=-kmxpXBd95PCIeNR0GEuQiUyKYFdEigKSQPe6KvtsKc%3D&token-time=1793836800

BONUS PART STARTS AT 20:51 Watch here (with no ads) or on YouTube: https://youtu.be/QD5sJ636wxM More interviews: https://www.patreon.com/collection/44300/ 🟣 Guest: Dr. Sanjoy Som https://www.bluemarblespace.org/ 📜 Multistage Rocket Optimization, Geophysics, and the Spacefaring Envelope of Habitable Super-Earths https://arxiv.org/abs/2607.02691 Rockets fight against gravity to help us as a civilization escape into space. But what if a planet is much heavier? How big and dense does it need to get before a civilization gets permanently trapped and can't go to space? • 00:00 Intro • 01:16 Escaping the gravity well • 06:53 Limiting factors • 09:47 Rockets • 15:18 Can a civilizations get trapped • 20:51 Geology-driven civilization • 32:54 Current obsessions • 39:11 Final thoughts

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