TWiS 230: Living on Lava Worlds - Atmospheres on Lava-Covered Exoplanets

Think you're having a hot summer? Try living on 55 Cancri-e, a super-Earth with daytime temperatures above 4000 degrees Fahrenheit. Most of these super-Earths orbit frighteningly close to their host stars and have long since had their atmospheres scraped away, leaving them baked, parched rocks. But some, like 55 Cancri, still have dense envelopes of air. How is that possible, when the planet is 20 times closer to its star than our own planet Mercury? Dr. Laura Schaefer explains how molten lava worlds defy the odds. Plus: Starship update, the first orbital data centers, and a new year on Mars. Headlines: SpaceX's Starship Achieves First Full Orbital Flight With Satellite Deployments Google and Planet Labs Launch AI Data Center Satellite Multiple SpaceX Launches Within Hours Mark a New Operational Standard Cowboy Space Debuts Power-Beaming AI Data Center in Orbit Mars Celebrates a New Year on Its Extended Journey Around the Sun NASA Anniversary and Notable Space Birthdays Noted Main Topic: Living on Lava Worlds—Atmospheres, Extreme Planets, and the Search for Life Early Exoplanet Detection Methods and Evolution of Exoplanet Surveys Cosmic Shoreline Concept: How Gravity and Stellar Radiation Shape Planetary Atmospheres Airless Valleys, Sandbars, and Other New Categories for Rocky Exoplanets Permanent Magma Oceans: Why Some Lava-covered Worlds Retain Atmospheres Volatiles, Atmosphere Loss, and The Soda-Bottle Effect on Hot Exoplanets Sandbar Regime: Superheated Planets Keep Atmospheres Longer Than Expected Case Study: 55 Cancri e and the Myth of the Diamond Planet K2-18b: Possibilities of a Water World or Another Magma-Lava Hybrid Redefining Goldilocks Zones With Atmospheric Survival Factors Tidal Heating, Volcanism, and Dynamics Shaping Exoplanet Atmospheres Future Directions: Webb Telescope, Habitable Worlds Observatory, and Prospects for Imaging True "Earths" Hosts: Rod Pyle and Tariq Malik Guest: Dr. Laura Schaefer Download or subscribe to This Week in Space at https://twit.tv/shows/this-week-in-space. Join Club TWiT for Ad-Free Podcasts! Support what you love and get ad-free audio and video feeds, a members-only Discord, and exclusive content. Join today: https://twit.tv/clubtwit Sponsors: helixsleep.com/space coveron.com/thisweekinspace and use code thisweekinspace