What does finding methane on Mars mean? How long ago could have life evolved on Mars? How much influence can the gut microbiome have on the human body? These topics and more in this episode of The Planetary News Radio. Visit on the web at: http://www.iiress.com/planetary/podcasts. Join the discussion on Discord at: https://discord.gg/5HQj8eC. Support on Patreon at: https://www.patreon.com/planetarynews.