
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.
Latest episodes

5 snips
Apr 6, 2022 • 45min
Neptune Odyssey: why we need to visit an ice giant
Recommendations made in the 2023-2032 Planetary Science and Astrobiology Decadal Survey will be revealed on April 19. One of the 11 design studies commissioned for the survey explores a flagship mission to Neptune. The Neptune Odyssey project engineer is Brenda Clyde. Her colleague, Kirby Runyon, is the project scientist. They’ll take us inside this exciting concept and remind us of why an ice giant orbiter is long overdue. Even Bruce Betts and Mat Kaplan were surprised by the answer to this week’s space trivia contest. You’ll hear it and more in What’s Up. Hear and discover more at https://www.planetary.org/planetary-radio/2022-brenda-clyde-kirby-runyon-neptune-odysseySee omnystudio.com/listener for privacy information.

Mar 30, 2022 • 56min
X-raying the universe with Martin Weisskopf
He helped invent X-ray astronomy more than 50 years ago. Martin Weisskopf still leads the field as project scientist for the spectacular Chandra X-ray Observatory and principal investigator for the brand new Imaging X-ray Polarimetry Explorer or IXPE. He’ll help us zero in on the most energetic and enigmatic objects in the cosmos. NASA’s fiscal year 2023 budget proposal has just been unveiled. Chief advocate Casey Dreier will break it down. We’ll close with the first words from the Moon in this week’s What’s Up. Discover more at https://www.planetary.org/planetary-radio/2022-martin-weisskopf-xipe-x-ray-astronomySee omnystudio.com/listener for privacy information.

Mar 23, 2022 • 53min
Legendary Space Physics Pioneer Margaret Kivelson
At 93, Margaret Kivelson is still at the center of space science and policy. In this charming conversation she shares anecdotes about her early life, how she entered the new field of space physics and some of her groundbreaking work, including discovery of convincing evidence for a saltwater ocean under the ice on Jupiter’s moon Europa. Bruce and Mat offer another great prize from Chop Shop in this week’s What’s Up space trivia contest. Discover more at https://www.planetary.org/planetary-radio/2022-margaret-kivelsonSee omnystudio.com/listener for privacy information.

Mar 18, 2022 • 33min
Planetary Radio Special Edition: The Voyager Golden Record by Twenty Thousand Hertz
We are honored to offer you this outstanding episode of one of our favorite podcasts. Twenty Thousand Hertz reveals the stories behind the world's most recognizable and interesting sounds. Here they present the Voyager Golden Record carried by those beloved spacecraft that have departed our solar system on a journey to the stars. We hope you'll enjoy it as much as we have. We'll be back with a regular episode of Planetary Radio every Wednesday.See omnystudio.com/listener for privacy information.

Mar 16, 2022 • 1h 1min
Meet the first STEP Grant awardees
Citizen scientists will soon have another opportunity to become part of the search for extraterrestrial intelligence, and an innovative project will use a subtle effect of sunlight to learn about near-Earth objects. These are the projects funded in the first round of The Planetary Society’s Science and Technology Empowered by the Public (STEP) grant program. We’ll meet the awardees after Society chief scientist Bruce Betts provides an overview. Bruce returns for this week’s What’s Up and the space trivia contest. Discover more at https://www.planetary.org/planetary-radio/2022-first-step-grant-awardeesSee omnystudio.com/listener for privacy information.

Mar 9, 2022 • 48min
Water, water everywhere with Bethany Ehlmann
Planetary scientist Bethany Ehlmann has co-authored a paper presenting evidence that liquid surface water flowed on Mars as much as a billion years more recently than previously thought. That’s an extra billion years for possible life to have formed and thrived. We’ll also join Planetary Society editor Rae Paoletta as she explores water worlds throughout our solar system in a new article. Another great prize awaits the winner of the What’s Up space trivia contest. Discover more at https://www.planetary.org/planetary-radio/2022-bethany-ehlmann-mars-waterSee omnystudio.com/listener for privacy information.

Mar 4, 2022 • 1h 28min
Space Policy Edition: Why are outer planets missions so expensive?
It's the 50th anniversary of Pioneer 10, the first spacecraft to the outer planets. Pioneers 10 and 11 were scrappy, low-cost endeavors that blazed the path for future exploration. But the future has been expensive: outer planets missions are some of the priciest planetary probes in history. Can we get back to a pioneering spirit and increase the frequency of outer planet exploration? To find out, we talk with Mark Wolverton, author of “The Depths of Space: The Story of the Pioneer Probes,” and Scott Bolton, principal investigator for Juno, the most affordable Jupiter mission in decades. Casey and Mat also discuss the dynamic and tragic situation in Ukraine, and its implications for space. Discover more here: https://www.planetary.org/planetary-radio/pioneer-10-and-11-bolton-wolvertonSee omnystudio.com/listener for privacy information.

Mar 2, 2022 • 48min
5,000 worlds and counting: the success of TESS
Michelle Kunimoto was one of Forbes magazine’s 30 Under 30 in science. Now she leads the most successful search for exoplanets that relies on data delivered by the Transiting Exoplanet Survey Satellite or TESS. She shares this fast-growing catalog of worlds in her first Planetary Radio conversation. Bruce Betts and Mat Kaplan also kick off a new series of great prizes in the What’s Up space trivia contest. Discover more at https://www.planetary.org/planetary-radio/2022-michelle-kunimoto-tessSee omnystudio.com/listener for privacy information.

Feb 23, 2022 • 1h 5min
Astrobiologist David Grinspoon on life, the universe and everything
Astrobiologist, planetary scientist, author and science communicator David Grinspoon has just been named a lifetime fellow of the American Association for the Advancement of Science. He returns to Planetary Radio for a wide-ranging conversation about the state of our search for life across the solar system and beyond. We also learn what it was like to grow up in a home visited regularly by Carl Sagan and Isaac Asimov. Plus, get out your pencils and calculators! Bruce Betts delivers another cosmic arithmetic challenge in the space trivia contest. Discover more at https://www.planetary.org/planetary-radio/2022-david-grinspoonSee omnystudio.com/listener for privacy information.

Feb 16, 2022 • 57min
Saving the world one telescope at a time: The Shoemaker NEO grant winne
The Planetary Society has awarded another eight Gene Shoemaker near-Earth object grants to outstanding amateur astronomers and observatories around the world. We’ll meet recipients from Chile, Croatia and the United States after chief scientist Bruce Betts tells us about the program. Bruce will then return with Mat Kaplan for yet another What’s Up tour of the sky and a new space trivia contest. Discover more at https://www.planetary.org/planetary-radio/2022-shoemaker-neo-awardsSee omnystudio.com/listener for privacy information.