Ripples on the Cosmic Ocean

What happens in space doesn’t stay in space. Historian Dagomar Degroot joins Planetary Radio host Sarah Al-Ahmed to explore how shifting solar cycles, volcanic eruptions on Venus, Martian dust storms, and even mistaken sightings of lunar forests have influenced life, science, and society on Earth. His new book, “Ripples on the Cosmic Ocean: An Environmental History of Our Place in the Solar System,” reframes the Solar System as part of our cosmic environment, one that has shaped humanity’s past and will define our future. Then, Planetary Society Director of Government Relations Jack Kiraly updates us on the latest developments in space policy, including the ongoing search for NASA’s next administrator and proposed changes to the Artemis program’s launch vehicles. And stick around for Bruce Betts, The Planetary Society’s chief scientist, in What’s Up. Discover more at: https://www.planetary.org/planetary-radio/2025-ripples-on-the-cosmic-oceanSee omnystudio.com/listener for privacy information.

In this second installment of Planetary Radio’s coverage from the 2025 NASA Innovative Advanced Concepts Symposium in Philadelphia, Pennsylvania, host Sarah Al-Ahmed highlights more of the technologies presented by the NIAC fellows. Mary Knapp of MIT Haystack Observatory shares her team’s Great Observatory for Long Wavelengths project, a space-based radio array designed to detect magnetic fields around distant exoplanets. Michael Hecht, also from MIT Haystack Observatory and principal investigator for the MOXIE experiment on NASA’s Perseverance rover, discusses Exploring Venus with Electrolysis, a concept that could turn Venus’s dense atmosphere into fuel for long-duration flight and exploration. Benjamin Hockman from NASA’s Jet Propulsion Laboratory introduces two projects: Gravity Poppers, tiny hopping probes that could map the interiors of asteroids and comets, and his team’s concept for a Venus balloon observatory. Finally, Justin Yim from the University of Illinois Urbana-Champaign presents LEAP, a legged robot designed to hop through the icy plumes of Saturn’s moon Enceladus in search of clues to its hidden ocean. Then stay tuned for What’s Up with Dr. Bruce Betts, chief scientist of The Planetary Society. Discover more at: https://www.planetary.org/planetary-radio/2025-niac-symposium-part-2See omnystudio.com/listener for privacy information.

The American fascination with spaceflight and what we might find out there began long before any human left Earth. It’s Dr. Margaret Weitekamp’s job to collect, document, and preserve the cultural artifacts that display our deep attraction to all things spacey. Her book, Space Craze, explores how these objects, ranging from 1930s Flash Gordon ray guns to Mercury space capsule cookie jars, have represented our Earthbound fears and hopes. She joined the Society’s space-crazed Mat Kaplan for a live and lively conversation. Discover more at: https://www.planetary.org/planetary-radio/book-club-margaret-weitekampSee omnystudio.com/listener for privacy information.

Each year, NASA’s Innovative Advanced Concepts program (NIAC) funds visionary ideas that could shape the future of space exploration. In this first of two episodes from the 2025 NIAC Symposium in Philadelphia, Pennsylvania, USA, Planetary Radio host Sarah Al-Ahmed introduces some of the concepts presented at this year’s event. You’ll hear from Martin Bermudez and Josh Simpson from Skyeports LLC. Bermudez is the company’s CEO and principal investigator for the LUNGS Project, and Simpson is a glass artist and co-investigator. Together, their team is exploring how to build glass-blown lunar habitats from melted Moon dust. You’ll also meet Christine Gregg, research engineer at NASA’s Ames Research Center, who’s developing architected metamaterials to stabilize giant space structures. And finally, John Mather, Nobel laureate and senior astrophysicist at NASA’s Goddard Space Flight Center, shares his team’s work on an inflatable starshade that could help us see Earth-like worlds around distant stars. Then stick around for What’s Up with Dr. Bruce Betts, chief scientist of The Planetary Society. Discover more at: https://www.planetary.org/planetary-radio/2025-niac-symposium-part-1See omnystudio.com/listener for privacy information.

On October 6, 2025, hundreds of space advocates from across the United States joined The Planetary Society and 20 partner organizations on Capitol Hill to deliver one clear message: protect NASA’s science budget. We begin with Ari Koeppel, AAAS Science & Technology Policy Fellow and Space Policy Intern at The Planetary Society, who shares why this moment matters for scientists facing uncertainty about their future. Then Britney Schmidt, planetary scientist at Cornell University and member of The Planetary Society’s Board of Directors, calls in from Washington, D.C., to share what it’s like on the ground as hundreds of advocates come together to defend the future of space science. Next, we take you to the press conference on the steps of the U.S. Capitol, featuring Bill Nye, CEO of The Planetary Society, Representative Glenn Ivey of Maryland’s 4th District, Marcel Agüeros, president-elect of the American Astronomical Society, and Brandon Jones, President of the American Geophysical Union. Together, they urge Congress to restore NASA’s science funding and maintain the United States' leadership in discovery. We close with Casey Dreier, chief of space policy at The Planetary Society, reflecting on the power of grassroots advocacy and what comes next for the Save NASA Science campaign. Finally, in What’s Up, Bruce Betts, The Planetary Society’s chief scientist, joins host Sarah Al-Ahmed to look ahead, exploring the great mysteries we could solve in the coming years if we continue to invest in space science. Discover more at: https://www.planetary.org/planetary-radio/2025-day-of-action-for-nasa-scienceSee omnystudio.com/listener for privacy information.

If the United States is indeed in a space race with China, then we cannot abandon space science. That’s the claim made by Maxwell Zhu and The Planetary Society’s chief of space policy, Casey Dreier, in a recent op-ed in Payload Space. Their piece contrasted the growing ambitions of China’s coming space science program against the draconian cuts proposed by the White House in 2026. The results are stark: where China is pursuing new missions, the United States is abandoning them. Casey and Maxwell explore why this is the case, whether China sees this investment as part of a competition at all, and the structural challenges of integrating space science into a geopolitical context. Discover more at: https://www.planetary.org/planetary-radio/maxwell-zhu-on-chinas-space-science-ambitionsSee omnystudio.com/listener for privacy information.

NASA’s Perseverance rover has made one of its most intriguing discoveries yet in Jezero Crater. A rock sample called Sapphire Canyon, drilled from the Bright Angel formation, contains unusual chemical and mineral patterns that may be potential biosignatures. We begin with remarks from Morgan Cable, research scientist at NASA’s Jet Propulsion Laboratory and co–deputy principal investigator of the PIXL instrument on Perseverance, in a video released alongside NASA’s September 10, 2025 announcement.  Then, host Sarah Al-Ahmed speaks with Joel Hurowitz, associate professor of geosciences at Stony Brook University and deputy principal investigator of the PIXL instrument on Perseverance, who is also the lead author of the new Nature paper detailing the findings. Hurowitz explains how textures nicknamed "poppy seeds" and "leopard spots" connect organic carbon with minerals like vivianite and greigite, and why these could represent some of the most compelling evidence yet for ancient microbial life on Mars. Finally, in this week’s What’s Up, Bruce Betts, The Planetary Society’s chief scientist, joins Sarah to explore earlier moments in the history of Mars exploration when tantalizing hints of life sparked scientific and public excitement. Discover more at: https://www.planetary.org/planetary-radio/2025-perseverence-biosignaturesSee omnystudio.com/listener for privacy information.

Bill Nye, CEO of The Planetary Society, has officially joined the Hollywood Walk of Fame. In this episode, we speak with Bill about what this rare honor means to him and to science communication. Then, we take you inside the star ceremony in Los Angeles, where friends and fans, including Boston Celtics star Jaylen Brown, paid tribute to his legacy. From there, we shift to Washington, D.C., where NASA faces the threat of deep budget cuts. Planetary Society Chief of Space Policy Casey Dreier and Director of Government Relations Jack Kiraly share the latest updates as we prepare for the upcoming Day of Action. We close with Bruce Betts and What’s Up, reflecting on the unexpected adventures that come with working in space science. Discover more at: https://www.planetary.org/planetary-radio/2025-bill-nye-starSee omnystudio.com/listener for privacy information.

Only six people have received The Planetary Society’s Cosmos Award for Outstanding Public Presentation of Science. We were honored to present it to author and historian Dava Sobel in May of 2025. She has created a brilliant library of books that illuminate the lives and work of great scientists, many of whom have been under-appreciated. Each of Dava’s works is also overflowing with the wonder of science and discovery. It’s no wonder we decided to feature Dava and her books in the Society book club. That month-long celebration was capped by a live, online interview conducted by Dava’s friend and fan Mat Kaplan.  Here’s that conversation.  Discover more at: https://www.planetary.org/planetary-radio/book-club-dava-sobelSee omnystudio.com/listener for privacy information.

Pack your cosmic suitcase. This week on Planetary Radio, host Sarah Al-Ahmed is joined by Mark McCaughrean, astronomer, science communicator, and former Senior Advisor for Science & Exploration at the European Space Agency, to talk about his new book, “111 Places in Space That You Must Not Miss.” Part of the popular “111 Places” travel series, the book transforms the guidebook format into a tour across the Solar System and beyond, from Apollo landing sites on the Moon to Europa’s hidden oceans, and even the afterglow of the Big Bang. Mark shares highlights from the book, stories from his career on missions like Hubble, Rosetta, and the James Webb Space Telescope, and reflections on how science and imagination come together to inspire exploration. And in this week’s What’s Up, Planetary Society Chief Scientist Bruce Betts joins Sarah to talk about his brand-new children’s books, “The Size of Space” and “Are We Alone?,” part of our growing series with Lerner Publishing Group. Discover more at: https://www.planetary.org/planetary-radio/2025-111-places-in-spaceSee omnystudio.com/listener for privacy information.