Planetary Radio: Space Exploration, Astronomy and Science

Alicia Brown from the Commercial Space Federation and Brittany Webster from the American Geophysical Union join the show to discuss NASA’s fiscal year 2026 budget proposal, which aims to slash the agency’s funding by nearly 25%, cut science by 47%, and reduce staffing to levels not seen since 1960. Discover more at: https://www.planetary.org/planetary-radio/fy2026-nasa-budget-discussionSee omnystudio.com/listener for privacy information.

The Giant Magellan Telescope (GMT) is poised to become one of the most powerful ground-based observatories ever built. On June 12, 2025, the U.S. National Science Foundation announced that the GMT will enter its Major Facilities Final Design Phase, bringing it one step closer to full construction. This week on Planetary Radio, host Sarah Al-Ahmed speaks with Rebecca Bernstein, Chief Scientist for the Giant Magellan Telescope Organization and astronomer at the Carnegie Institution for Science, about the groundbreaking technology behind GMT and how it will transform our understanding of the Cosmos. Later in the show, Casey Dreier, chief of space policy at The Planetary Society, returns to discuss his new op-ed in Space News on the White House’s controversial Mars plan, and why a bold vision without political consensus is unlikely to succeed. As always, we wrap up with What’s Up with Bruce Betts, chief scientist at The Planetary Society. Discover more at: https://www.planetary.org/planetary-radio/2025-gmtSee omnystudio.com/listener for privacy information.

Few writers have captured the wonder of science through storytelling as powerfully as Dava Sobel. In this episode, we celebrate her remarkable career and her recent honor as the recipient of The Planetary Society’s 2025 Cosmos Award for Outstanding Public Presentation of Science. Mat Kaplan, senior communications advisor at The Planetary Society, sits down with Sobel for a conversation about the human lives behind great scientific discoveries, from Galileo and Copernicus to the women of the Harvard Observatory and Marie Curie’s lab.  Later in the show, Jack Kiraly, our director of government relations, joins us with an encouraging update on our public advocacy campaign to save NASA science. And don’t miss What’s Up with Bruce Betts, where we reflect on the role of science communicators and share a fresh Random Space Fact. Discover more at: https://www.planetary.org/planetary-radio/2025-cosmos-awardSee omnystudio.com/listener for privacy information.

What does it take to turn a love of space into a global career in science journalism? Sarah Cruddas has done just that. With a background in astrophysics and a passion for storytelling, she’s become a leading voice in space media, covering rocket launches, interviewing astronauts, and writing books that bring the Cosmos down to Earth. In this episode, Sarah shares her path from the U.K. to the front lines of space communication and why she believes storytelling is essential to the future of exploration. She also reflects on the challenges of breaking into the field, the power of listening, and how space can unite people across the globe. Plus, Bruce Betts joins us for What’s Up, where we talk about what makes a great space journalist. Discover more at: https://www.planetary.org/planetary-radio/2025-making-space-matterSee omnystudio.com/listener for privacy information.

Former NASA Chief Economist Akhil Rao explains why NASA needs economic expertise to navigate the complex—and often misunderstood—market forces that will determine the success or failure of its private partnerships. As NASA relies ever more on commercial companies to enable its own exploration efforts, it is imperative, Rao believes, to provide clear-eyed perspectives that highlight the challenges and solutions required to reach success. And why NASA puts itself at risk for pursuing faith-based program investments after dissolving the strategy and economics team at the agency a few months ago. Discover more at: https://www.planetary.org/planetary-radio/space-economy-akhil-raoSee omnystudio.com/listener for privacy information.

The White House has released its Fiscal Year 2026 congressional budget justification for NASA, and the implications are staggering. If enacted, this proposal would slash NASA’s science program funding by nearly half, cancel dozens of active and upcoming missions, and reduce the agency’s workforce by one-third. Sarah Al-Ahmed is joined by Jack Kiraly, The Planetary Society’s director of government relations, to examine what’s in the nearly 500-page document, what it means for the future of space science and exploration, and how advocates can still act to save NASA science. Then, in What’s Up, Planetary Society Chief Scientist Bruce Betts shares insights on China’s newly launched asteroid sample return mission, Tianwen-2. The spacecraft will rendezvous with near-Earth asteroid 469219 Kamoʻoalewa, offering new scientific opportunities amidst a moment of global uncertainty in space exploration. Discover more at: https://www.planetary.org/planetary-radio/2025-FY-2026-budget-proposalSee omnystudio.com/listener for privacy information.

Join Rosaly Lopes, a senior research scientist at NASA's Jet Propulsion Laboratory and an expert in planetary volcanology, as she unveils the secrets of volcanic activity across the Solar System. Explore the fiery landscapes of Jupiter's moon Io and the surprising volcanic features on Venus, thanks to groundbreaking radar data. Discover intriguing cryovolcanic signs on dwarf planets Eris and Makemake, and marvel at the latest findings from the Juno mission. Space geology has never been more thrilling!

Casey Dreier, Chief of Space Policy at The Planetary Society, Ambre Trujillo, Digital Community Manager, and Jack Kiraly, Director of Government Relations, dive deep into the value and future of space exploration. They tackle common misconceptions about NASA, highlighting its vital role against private sector limitations. The trio discusses community advocacy for NASA funding and the crucial impact of space technology on Earth’s challenges, including climate change. Tune in for insights on how space science shapes our world while encouraging the next generation of explorers.

This week on Planetary Radio, we explore the decades-long journey of Kosmos 482, a Soviet-era Venus probe that spent 53 years orbiting Earth before its dramatic return on May 10, 2025. Ben Fernando, a postdoctoral researcher in seismology and planetary science at Johns Hopkins University, joins us to explain the history of Kosmos 482 and how seismology and acoustic sensors are helping scientists detect and locate objects impacting Earth. Then Bruce Betts, our chief scientist, joins us for What's Up, where we look back at the largest human-made objects ever to crash back to Earth. Discover more at: https://www.planetary.org/planetary-radio/2025-kosmos-482See omnystudio.com/listener for privacy information.

Join planetary geochemist Chris Glein, who specializes in ocean worlds, and Jack Kiraly, Director of Government Relations at the Planetary Society, as they dive into the fascinating exoplanet TOI-270d. Discover the groundbreaking findings from the James Webb Space Telescope regarding the atmospheric chemistry of sub-Neptunes and their potential for life. The conversation also highlights looming budget cuts to NASA, threatening vital science programs, and emphasizes the need for public advocacy to secure support for space exploration.