Theia’s Fate, Galaxy Mergers & the Mysteries of Mars’ Atmosphere | Q&A | Space Nuts: Astronomy...

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Recorded09 Feb 2026

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Sponsor Link: This episode of Space Nuts brought to you by Incogni .Reduce the volume of spam calls and emails. They can't spam you if the can't find you. To find out more and to take up our 60% off offer , visit incogni.com/spacenuts (https://incogni.com/spacenuts) and use the cou[on code SPACENUTS at checkout. Theia's Fate, Galactic Mergers, and the Mysteries of Hydrogen In this captivating Q&A edition of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson tackle a range of intriguing questions from listeners, diving deep into cosmic mysteries and scientific theories. From the fate of the former planet Theia to the dynamics of galaxy mergers and the origins of hydrogen, this episode is packed with insights that will expand your understanding of the universe. Episode Highlights: - The Fate of Theia: Rusty from Donnybrook poses a thought-provoking question about Theia, the planet that collided with Earth. Andrew and Fred discuss the most accepted theories regarding Theia's remnants and how they may have been absorbed into Earth's mantle, leaving behind intriguing geological evidence. - Galaxy Mergers Explained: New listener Melina asks about the merging of spiral galaxies in an expanding universe. The hosts explain how gravity can overcome the universe's expansion on galactic scales, leading to fascinating interactions and eventual mergers between galaxies. - Olympus Mons and Mars' Atmosphere: Kevin wonders if the colossal eruptions of Olympus Mons could have contributed to Mars' atmospheric loss. Andrew and Fred explore the volcanic activity on Mars and clarify that while Olympus Mons is impressive, the planet's lack of a magnetic field is a more significant factor in its atmospheric decline. - Hydrogen's Cosmic Origins: Five-year-old Yuki asks why hydrogen is the only element not formed in stars. The hosts explain that hydrogen was created shortly after the Big Bang, making it the most abundant element in the universe, while other elements formed later through stellar processes. For more Space Nuts, including our continuously updating newsfeed and to listen to all our episodes, visit our website. (https://www.spacenutspodcast.com/) Follow us on social media at SpaceNutsPod on Facebook, Instagram, and more. We love engaging with our community, so be sure to drop us a message or comment on your favorite platform. If you’d like to help support Space Nuts and join our growing family of insiders for commercial-free episodes and more, visit spacenutspodcast.com/about (https://www.spacenutspodcast.com/about) . Stay curious, keep looking up, and join us next time for more stellar insights and cosmic wonders. Until then, clear skies and happy stargazing. Become a supporter of this podcast: https://www.spreaker.com/podcast/space-nuts-astronomy-insights-cosmic-discoveries--2631155/support (https://www.spreaker.com/podcast/space-nuts-astronomy-insights-cosmic-discoveries--2631155/support?utm_source=rss&utm_medium=rss&utm_campaign=rss) . Episode link: https://play.headliner.app/episode/31570932?utm_source=youtube

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