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Planetary Radio: Space Exploration, Astronomy and Science

The Planetary Society

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

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All Episodes

45:16

Observatory Director Francisco Córdova on the...

Planetary Radio: Space Exploration, Astronomy and... ·

2020/12/02

The 900-ton instrument platform suspended high above the giant Arecibo dish crashed downward in the early morning hours of December 1st. Host Mat Kaplan had recorded a conversation with the leader of the observatory just hours before the disaster. You’ll hear it here, along with a reflection on the magnificent radio telescope by Bill Nye, and further comments by Planetary Society Chief Scientist Bruce Betts. We’ve also got space headlines and a brand-new prize for a brand-new space trivia contest

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53:48

More Moon Water and an Update from Venus on Our 18th...

Planetary Radio: Space Exploration, Astronomy and... ·

2020/11/25

We celebrate 18 years of Planetary Radio with two great features and 10 personal questions for host Mat Kaplan from Planetary Society Chief Scientist Bruce Betts. Astronomer Jane Greaves is back with an update on the phosphine gas detected above Venus.Then we find water right out under the Sun on our own Moon.Research leader Casey Honnibal tells us how her team found it using the SOFIA telescope on a 747. Learn more at

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61:32

Revealing Mars From Above, and Crew Dragon is Go!

Planetary Radio: Space Exploration, Astronomy and... ·

2020/11/18

Jeffrey Plaut and Richard Zurek are the project scientists for two of the most successful and long-lived Mars missions. Their orbiters, Mars Odyssey and the Mars Reconnaissance Orbiter, are still delivering great science, even after 19 years above the Red Planet for Odyssey. We’ve also condensed the first 29 hours of the first operational Crew Dragon mission into 98 thrilling seconds. You’ll get a chance to win The Spacefarer’s Handbook in this week’s What’s Up space trivia contest. Learn more at

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56:53

Space Policy Edition: NASA's Post-Election Landscape

Planetary Radio: Space Exploration, Astronomy and... ·

2020/11/13

The United States' 2020 elections are over. What do the results mean for NASA in the years ahead? To help answer that question, we welcome back Brendan Curry, The Planetary Society's Chief of D.C. Operations.Join us as we review the changes in Congress and the White House that will impact the direction of the U.S. space program. Explore more here. https://www.planetary.org/planetary-radio/1002-2020-spe-brendan-curry-election-reviewSee omnystudio.com/listener for privacy information.See

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55:26

A Rogue World Wanders as PlanetVac Heads for the Moon...

Planetary Radio: Space Exploration, Astronomy and... ·

2020/11/11

In a jam-packed episode, we’ll talk to a discoverer of a distant, lonely planet that wanders the galaxy, and then turn to plans to send a radically-simple sample collection system to the Moon and Mars’ moon Phobos. Planetary Society CEO Bill Nye will add his congratulations for the PlanetVac team. We’ve also got a signed copy of Bill’s latest book for the winner of the new What’s Up space trivia contest. Learn more at

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67:27

A Return to Asteroid Mining, and Digging Into Space...

Planetary Radio: Space Exploration, Astronomy and... ·

2020/11/04

At least two ambitious, smart asteroid mining companies have gone bust. Joel Sercel makes the case that his new effort comes at a much better time, and with a better approach. He’ll also share his audacious plan for mining water on the Moon, along with his concerns regarding humanity’s spread across the solar system.Can we avoid the mistakes made in past eras of exploration and expansion? You’ve got one more chance to win your own asteroid—a small, rubber one—in this week’s What’s Up space trivia

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44:59

A Deep Dive into Asteroid Bennu With Dante Lauretta

Planetary Radio: Space Exploration, Astronomy and... ·

2020/10/28

We are joined by the leader of the OSIRIS-REx mission that sampled an asteroid last week. Dante reveals just how brilliantly successful the encounter was, and describes preparations for the journey back to Earth. Space journalist Nancy Atkinson tells us about Orbilander, a mission that would orbit and then descend to Saturn’s moon Enceladus in a search for life. Space headlines from The Downlink and our weekly visit with Chief Scientist Bruce Betts round out this week’s show. Explore more at

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50:11

We Have Sampled an Asteroid! And the Search for Life...

Planetary Radio: Space Exploration, Astronomy and... ·

2020/10/21

OSIRIS-REx has done it! We have special coverage of the spacecraft’s successful collection of a sample from asteroid Bennu. Then we talk with Jane Greaves, leader of the team that found evidence of phosphine gas in the atmosphere of Venus. Has this put us on the road to discovery of life above that hellish world? Bruce Betts and Mat Kaplan offer a copy of Beyond Earth’s Edge: The Poetry of Spaceflight in the new space trivia contest. Learn more at

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67:57

Beyond Earth’s Edge: A Celebrity Space Poetry Jam!

Planetary Radio: Space Exploration, Astronomy and... ·

2020/10/14

Beyond Earth’s Edge: The Poetry of Spaceflight is the new and outstanding collection of poems edited by Julie Swarstad Johnson and Christopher Cokinos. They’ll join us to hear poems in the collection read by Bill Nye, Robert Picardo, Sasha Sagan, astronauts, scientists and others.Bruce Betts looks away from the night sky long enough to pen his own poetic contribution.We’ve also got space headlines from The Downlink, and a new space trivia contest.Learn more at

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69:54

Protectors of Earth! (and Other Worlds)

Planetary Radio: Space Exploration, Astronomy and... ·

2020/10/07

Protecting worlds like Earth and Mars from microscopic invaders carried by human and robot visitors was just one of the scores of topics covered at this year’s Humans to Mars summit. Mat Kaplan moderated a panel featuring planetary scientist and New Horizons mission principal investigator Alan Stern, NASA associate administrator Mike Gold, and NASA planetary protection officer Lisa Pratt.Planetary Society digital editor Jason Davis shares the fascinating 40-year timeline that can be found in the

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53:25

Space Policy Edition: Divining Biden's Space Policy...

Planetary Radio: Space Exploration, Astronomy and... ·

2020/10/02

A month before the U.S. election Joe Biden's campaign has yet to state its goals for space and NASA. We asked Jeff Foust, one of the best space reporters in the business, to help us piece together a working model of a potential Biden Administration space policy. We comb through the available evidence, combining insights from Biden's history in the Senate, his 8 years as vice president, and current activities in the Democratic House of Representatives and party platform to create a prediction of what

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58:55

Exploring the Cosmos With Heidi Hammel and AURA

Planetary Radio: Space Exploration, Astronomy and... ·

2020/09/30

AURA, the Association of Universities for Research in Astronomy, is the organization that oversees operation of many of our world’s most powerful telescopes, including the Hubble Space Telescope. Veteran astronomer and planetary scientist Heidi Hammel is its Vice President for Science. Listen to her passionate argument for exploration by ground and space-based instruments and what they may tell us about ourselves. Only one cat has gone to space! You might win a tribute to that feline in the new

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70:44

A Fond Farewell: Solar System Specialist Emily...

Planetary Radio: Space Exploration, Astronomy and... ·

2020/09/23

Emily Lakdawalla was on the very first episode of Planetary Radio, and has been heard on hundreds since then. The planetary evangelist returns for a conversation like no other. Planetary Society CEO Bill Nye shares his thoughts after we hear from Emily.Got Mars?Bruce Betts tells us it’s brighter than Jupiter in the evening sky. He’ll tell you where to look during What’s Up. Much more of Emily can be heard at https://www.planetary.org/planetary-radio/0923-2020-emily-lakdawalla-farewell-nyeSee

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48:26

Have We Found Evidence of Life on Venus?

Planetary Radio: Space Exploration, Astronomy and... ·

2020/09/16

An international team has detected phosphine gas in the clouds above Venus. Naturally-produced phosphine on Earth is created by anaerobic bacteria. We’ll listen to portions of the media briefing at which this result was announced. Then we’ll get perspective on the find from the Planetary Society’s Casey Dreier. Astrophysicist and Venus atmosphere expert Javier Peralta will share his reaction and a big find of his own on our nearest planetary neighbor. Links and more are at

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51:42

Space Policy Edition: The Moon-to-Mars Strategy, with...

Planetary Radio: Space Exploration, Astronomy and... ·

2020/09/11

How spacefaring nations prioritize funding can be just as important, if not more so, than the capabilities of the commercial sector, says Dr. Mary Lynne Dittmar, President and CEO of the Coalition for Deep Space Exploration. She joins the show to talk how these complement each other, and why the SLS and Orion programs deserve support along with work by companies like SpaceX and Blue Origin. Mat and Casey also catch up on the dizzying amount of space news in July, including important progress on

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56:07

A Planetary Mystery is Solved, and it’s Bill Nye’s...

Planetary Radio: Space Exploration, Astronomy and... ·

2020/09/09

JPL’s Marc Rayman, former Dawn mission director, reveals the secrets of those bright spots on dwarf planet Ceres. First though we celebrate Bill Nye’s 10th anniversary as CEO of The Planetary Society. Chief Operating Officer Jennifer Vaughn is followed by the Science Guy himself. And there’s a Nye invention at the heart of this week’s What’s Up space trivia contest. Links and more are at

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52:40

The Sirens of Mars Call to Us

Planetary Radio: Space Exploration, Astronomy and... ·

2020/09/02

Georgetown University planetary scientist Sarah Stewart Johnson has written a beautiful book that chronicles our long quest for life on the Red Planet. That search may finally be reaching a climax with the new Perseverance rover and the beginnings of sample return. A copy of The Sirens of Mars will go to the winner of yet another What’s Up space trivia contest.In a nice coincidence, Bruce Betts will tell us where to find a brilliantly bright Mars in the night sky. Links and more are at

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48:11

Katie Mack and The End of Everything

Planetary Radio: Space Exploration, Astronomy and... ·

2020/08/26

Known as Astrokatie to her 370 thousand Twitter followers, astrophysicist and cosmologist Katie Mack has written a funny, fantastic guide to the end of the universe.The End of Everything (Astrophysically Speaking) explores five major scenarios for the big finish of the cosmos that scientists currently consider to be possible. We’ll award a copy of Katie’s book to the winner of this week’s What’s Up space trivia contest. Links and more are at

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57:17

Make Room! Worlds May Crowd Some Habitable Zones

Planetary Radio: Space Exploration, Astronomy and... ·

2020/08/19

Newly-published research led by Stephen Kane finds room for as many as 6 habitable zone planets around some stars. Why then is Earth on its own? The UC Riverside planetary scientist and astrobiologist will explain. Host Mat Kaplan is not prepared in the least for the latest space trivia contest question posed by Planetary Society chief scientist Bruce Betts. Do you read The Downlink? The Planetary Society’s great newsletter includes space headlines we review. Links and more are at

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48:43

Another Ray Gun Heads for Mars. We Hear It Working.

Planetary Radio: Space Exploration, Astronomy and... ·

2020/08/12

First there was ChemCam on Mars rover Curiosity. Now, SuperCam is on its way to the Red Planet aboard Perseverance. We’ll talk with principal investigator Roger Wiens about the new and improved, laser-firing instrument that delivers rock spectra and other science from a distance. SuperCam’s microphone will finally let us listen to the Martian wind and more. Mastcam-Z is right next to SuperCam on the Perseverance mast. You’ve turned it into great acronyms that we’ll share in What’s Up.Links and more

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1,353 results

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