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SpaceTime: Your Guide to Space & AstronomyThe Astronomy, Technology, and Space Science News Podcast. Author: Stuart Gary
Join host Stuart Gary for weekly explorations into Astronomy, Space, and Science News, featuring insights from 19 years on Australian Public Radio and industry experts.Become a supporter of this podcast: https://www.spreaker.com/podcast/spacetime-your-guide-to-space-astronomy--2458531/support. Language: en Genres: Astronomy, Natural Sciences, Science Contact email: Get it Feed URL: Get it iTunes ID: Get it |
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Earth's Hidden Mantle Secrets: Mars' Blue Past and the Cosmic Gas Pipeline of Galaxy Growth
Episode 12
Tuesday, 27 January, 2026
Sponsor Link:This episode is brought to you with thanks to Squarespace. Bring your stories to life with Squarespace, the easiest way to create an exceptional website, blog, portfolio, or online store. To take up our great offer and help support the show, just visit www.squarespace.com/spacetime or use the Promo Code SPACETIME at checkout.SpaceTime with Stuart Gary Gary - Series 29 Episode 12In this episode of SpaceTime, we uncover groundbreaking discoveries about Earth's mantle, the watery past of Mars, and the rapid growth of galaxies through cool gas filaments.Distinct Histories of Earth’s Mantle ProvincesRecent research reveals that the two massive continent-sized regions deep within the Earth's mantle have unique chemical compositions and histories. This study challenges long-held assumptions and uses seismic wave data to illustrate how these large low velocity provinces differ in density and material, impacting the planet's heat extraction from the core and potentially affecting the stability of Earth's magnetic field.Confirmation of Mars as a Blue PlanetNew evidence from ancient Martian river deltas suggests that Mars was once covered by a vast ocean. High-resolution images reveal delta-like structures, indicating that water once flowed into an ocean approximately 3 billion years ago. This discovery supports the notion of a once habitable environment on Mars, offering insights into its geological history and the potential for life.Galaxies Growing Through Cool Gas FilamentsA fascinating new study has demonstrated how galaxies can rapidly grow by drawing in filaments of cool gas. Observations from the Keck Telescope's Cosmic Webb Imager provide direct evidence of these gas streams spiraling into galaxies, fueling star formation at unprecedented rates. This research offers significant insights into the processes of galaxy formation and the role of the cosmic web in shaping the universe.www.spacetimewithstuartgary.com✍️ Episode ReferencesScientific ReportsMPJ Space ExplorationNature AstronomyBecome a supporter of this podcast: https://www.spreaker.com/podcast/spacetime-your-guide-to-space-astronomy--2458531/support.(00:00:00) Distinct histories of Earth's mantle provinces(00:12:15) Mars confirmed as a blue planet with ancient ocean(00:25:30) Galaxies grow rapidly through cool gas filaments(00:35:00) Discovery of the oldest known rock art in the world.
