Venus is the hottest, scariest planet in the solar system, but billions of years ago it may have been a lot like Earth, complete with an ocean of water. So, how did Venus go to hell? And could Earth be next?This is the final episode of our four-part series, <a href="https://www.vox.com/unexplainable/23165702/space-scientific-mysteries-venus-earth-mars-pluto-unexplainable-podcast">Lost Worlds</a>, and it originally ran on December 1, 2021.For more, go to <a href="http://vox.com/unexplainable">http://vox.com/unexplainable</a>It’s a great place to view show transcripts and read more about the topics on our show.Also, email us! <a href="mailto:unexplainable@vox.com">unexplainable@vox.com</a>We read every email.Support Unexplainable by making a financial contribution to Vox! <a href="https://www.vox.com/pages/support-now?utm_campaign=contribution&amp;utm_medium=referral&amp;utm_source=podcast">bit.ly/givepodcasts</a>Learn more about your ad choices. Visit <a href="https://podcastchoices.com/adchoices">podcastchoices.com/adchoices</a> Learn more about your ad choices. Visit <a href="https://podcastchoices.com/adchoices">podcastchoices.com/adchoices</a>

Vitamin X

Unexplainable takes listeners right up to the edge of what we know…and then keeps on going. The Unexplainable team — Noam Hassenfeld, Julia Longoria, Byrd Pinkerton, and Meradith Hoddinott — tackles scientific mysteries, unanswered questions, and everything we learn diving into the unknown. New episodes Mondays and Wednesdays.

From Vox and the Vox Media Podcast Network.