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Planetary Radio: Space Exploration, Astronomy and Science

The Planetary Society
Planetary Radio: Space Exploration, Astronomy and Science
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  • New Horizons: Celebrating a decade since the Pluto flyby
    On July 14, 2015, NASA’s New Horizons spacecraft made its historic flyby of Pluto, transforming our understanding of this distant world. Ten years later, we’re celebrating that iconic moment and the mission that made it possible. We begin with Alan Stern, principal investigator of the New Horizons mission, who reflects on the mission’s origins, its most surprising discoveries, and what comes next as New Horizons continues its journey through the Kuiper Belt. Then we check in with Adeene Denton, NASA postdoctoral program fellow at the Southwest Research Institute, who just returned from the “Progress in Understanding the Pluto System: 10 Years After Flyby” conference held at the Johns Hopkins University Applied Physics Laboratory. Adeene shares highlights from the event, which brought together scientists to explore new results from New Horizons, JWST, Hubble, and ground-based observatories on Pluto, Charon, and the broader Kuiper Belt. Finally, Planetary Society Director of Government Relations Jack Kiraly joins us with a major update on the ongoing fight to protect NASA science from devastating budget cuts. And don’t miss What’s Up with our Chief Scientist, Bruce Betts. We’re talking Arrokoth, the most distant Kuiper Belt object New Horizons visited after Pluto. Discover more at: https://www.planetary.org/planetary-radio/2025-new-horizons-pluto-flyby-10th-anniversarySee omnystudio.com/listener for privacy information.
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  • Book Club Edition: Andy Weir and Project Hail Mary
    Author Andy Weir was as shocked as anyone when The Martian became a top bestseller novel in the US. He repeated that achievement with his equally mind-blowing science fiction masterpiece Project Hail Mary. Former Planetary Radio host Mat Kaplan welcomed Andy in April of 2023 for the first livestreamed author conversation in The Planetary Society's member book club. Now, with the film version of Project Hail Mary approaching, we’re proud to begin making these insider interviews available to Planetary Radio listeners. We’ll post them on the third Friday of each month. Join us as we talk with Andy about his obsession with getting the science right while his reluctant and unlikely hero attempts to save humanity from a deep space scourge. Discover more at: https://www.planetary.org/planetary-radio/book-club-andy-weirSee omnystudio.com/listener for privacy information.
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  • Mat Kaplan’s first flight in zero-G
    What happens when scientists, students, space communicators, and refugee engineers float together in zero gravity? Former Planetary Radio host Mat Kaplan joins a remarkable group of flyers aboard a Zero-G flight organized by Space for Humanity. You’ll hear from participants and mentors including Emily Calandrelli, Sian Proctor, and Roxy Williams, as well as Space for Humanity Executive Director Antonio Peronace and Zero-G CEO Kevin Sproge. Together, they share how a few moments of weightlessness offered a powerful shift in perspective. We explore the mission to make space more inclusive, the awe of the “overview effect,” and what it means to carry that inspiration back down to Earth. Then, Bruce Betts joins us for What’s Up. Discover more at: https://www.planetary.org/planetary-radio/2025-mat-kaplan-zero-gSee omnystudio.com/listener for privacy information.
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  • First images from the Vera C. Rubin Observatory
    The Vera C. Rubin Observatory has shared its first public images, revealing millions of galaxies, stars, and asteroids in stunning detail. Stephanie Deppe, astronomy content strategist at Rubin Observatory, joins us to explain what makes these images so revolutionary, how the observatory works, and what’s coming next as Rubin prepares for its ten-year Legacy Survey of Space and Time. Later in the show, we reflect on the life and legacy of the observatory’s namesake, Vera Rubin, the groundbreaking astronomer who provided the first convincing evidence of dark matter. Jess Soto, STEM Strategies Coordinator at Mount Wilson Observatory and creator of Science Women Shirts, reflects on Rubin’s efforts to open up opportunities for women in space science. Then we close out the show with Bruce Betts in our regular What’s Up segment, featuring the discovery of a brand-new interstellar object, 3I/ATLAS, the third known object to travel through our Solar System from interstellar space. Discover more at: https://www.planetary.org/planetary-radio/2025-first-images-rubin-observatorySee omnystudio.com/listener for privacy information.
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  • Space Policy Edition: Are Democrats falling behind on space policy?
    Have Democrats ceded leadership in space policy? That’s what Mary Guenther believes. She’s the Director of Space Policy at the Progressive Policy Institute and the author of an editorial that claims Democrats have ceded their leadership. She traces the party’s arc from Obama-era reforms to recent data showing that Democrats introduced a third fewer space bills than Republicans in recent years, and proposes ways that the party should embrace this forward-looking field while tying it to their core issues of job creation, supply chains, and climate science.See omnystudio.com/listener for privacy information.
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About Planetary Radio: Space Exploration, Astronomy and Science

Planetary Radio brings you the human adventure across our Solar System and beyond. We visit each week with the scientists, engineers, leaders, advocates, and astronauts who are taking us across the final frontier. Regular features raise your space IQ while they put a smile on your face. Join host Sarah Al-Ahmed and Planetary Society colleagues including Bill Nye the Science Guy and Bruce Betts as they dive deep into space science and exploration. The monthly Space Policy Edition takes you inside the DC beltway where the future of the US space program hangs in the balance. Visit planetary.org/radio for an episode guide and much more.
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