The Most Important Rock In History Is Stuck In A Locker On Mars

We interrupt your regularly scheduled debunking of ancient astronaut theories for an emergency broadcast: We might have actually found aliens this time. No, really.

Scott and Tristan break down the discovery of the Cheyava Falls rock by the Perseverance rover. This dusty red doorstop features "leopard spots," which, on Earth, are a chemically specific signature of biological life. We discuss the rigorous science behind the "COLD" scale (Confidence of Life Detection), why this rock might be the most important thing ever drilled, and the agonizing reality that it is currently stuck millions of kilometres away because the Mars Sample Return mission is wildly over budget.

Then, to make sure you don't leave this episode feeling too hopeful, Tristan explains why finding independent microbial life on Mars might actually confirm that the "Great Filter" is ahead of us, and that we are all doomed.

Get new episodes early and support the show on Patreon and Nebula!

Subscribe to It's Probably (not) Aliens for weekly episodes about cool ancient history! And give us a 5-star review if you have the time. It really helps us out!

Tristan Johnson Bluesky | Twitter | YouTube

Scott Niswander Bluesky | Twitter | YouTube

Follow the show on Bluesky or Twitter for more updates!

Ask us questions and send us topics to talk about at ProbsNotAliens.com

Music by Rod Kim | Cover art by Skutch

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.