Rogue Planets & Exomoons with David Kipping

September 1, 2026

AI Summary

5 min read

In the search for alien life, one of the most frustrating patterns is the "false start"—a promising signal that gets walked back by theorists who find a non-biological explanation. Exoplanet scientist David Kipping, host of Cool Worlds, has seen this cycle play out repeatedly, from the Allen Hills meteorite to Venusian phosphine to the dimethyl sulfide detection on K2-18b. His proposed solution is not a better biosignature, but a better statistical strategy: split candidate planets into two groups designed to have the same rate of false positives but different likelihoods of hosting life, then look for a clean statistical difference between them. It is an approach borrowed from A/B testing, and it may be the most honest path forward as we build telescopes like the Habitable Worlds Observatory.

The Exomoon That Isn't Really a Moon

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What you'll learn

1 Rogue Planets & Exomoons with David Kipping
2 (01:41) **Welcome & Guest Introduction** - Neil deGrasse Tyson introduces David Kipping, associate professor of astronomy at Columbia University and host of *Cool Worlds*
3 (04:08) **The New Exomoon Candidate (CD-35 2729 b)** - Kipping explains a recent news-making discovery: a possible moon orbiting a brown dwarf that itself orbits an M dwarf star
4 (09:07) **How This Exomoon Was Detected** - The team used a coronagraph to separate light from the brown dwarf and the star, then measured Doppler shifts of the brown dwarf's light
5 (09:50) **Kipping's New Paper: A Statistical Strategy for Detecting Life** - Frustrated by repeated false alarms in the search for biosignatures, Kipping proposes an A/B testing approach
6 (14:00) **Space Fact Break** - If Earth rotated once every 90 minutes instead of 24 hours, centrifugal force would make everyone weightless
7 (16:35) **Cosmic Queries: LHS 1140 b's Atmosphere** - A Patreon supporter asks about this nearby rocky planet with a confirmed atmosphere, 48 light-years away

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Show Notes

Did we discover an exomoon? Neil deGrasse Tyson and Chuck Nice learn about the search for exoplanets with biosignatures, super Earths & mini Neptunes, and whether rogue planets outside of a solar system could harbor life with astrophysicist David Kipping.

NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free here:
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Thanks to our Patrons Eric Solomon, Jakob Jegge, william northup, Mariam Fischer, Beirne, Sean Fox, xKansasxCowBoyx, xoydev, David Ostrow, Daniel Ramsey,Jessie Caldwell, Tyrone P, Matt, Ajari T, David,Luis Molina, jamescory, Albert Maneri, Zachary Samuel, Ken Kaneda, Nicole Wolf Lady MacBrick, Ką čia spaust?!, Nav, Mike, Luke Fregona, Walter Mathews, Joe Mathews, Gabriel Patterson, Derek Richards, Hope Cliver, Daniel 3, Josh,Josh Mullins, Ken Tinkler, Robinson Medina-Sanchez, JOHN MOODY, Cynthia Elm, Lisa Rice, Trevor Stratton, Karl Forar, Don from NJ, Kaloyan Mehandzhiyski, Mike Tindal, Sean Jūshin Keijō, Jimmy Ebbert, Lincoln Berland, Nalita S, Bill Frye, Rick L Newman, Natalie Kendall, Gradient, Seth Pajak, Cassidy, Dominique, John Contreras, Josh, Carter Mican, Alok Yadav, Jon Hoover, and Eric Landeros for supporting us this week.

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