John Grunsfeld didn’t just ride the Space Shuttle into orbit five times. He accumulated two-and-a-half days of spacewalk time as he worked on the Hubble Space Telescope. The former NASA associate administrator returns to Planetary Radio for a very personal conversation with Mat Kaplan. We’ll also attend a screening of the great new documentary, “Goodnight Oppy” about the Mars Exploration Rovers. Sarah Al-Ahmed celebrates the 50th anniversary of the last Apollo moon mission, and Bruce Betts continues that theme with the new space trivia contest. Discover more at  https://www.planetary.org/planetary-radio/2022-john-grunsfeld-goodnight-oppy

John Grunsfeld didn’t just ride the Space Shuttle into orbit five times. He accumulated two-and-a-half days of spacewalk time as he worked on the Hubble Space Telescope. The former NASA associate administrator returns to Planetary Radio for a very personal conversation with Mat Kaplan. We’ll also attend a screening of the great new documentary, “Goodnight Oppy” about the Mars Exploration Rovers. Sarah Al-Ahmed celebrates the 50th anniversary of the last Apollo moon mission, and Bruce Betts continues that theme with the new space trivia contest. Discover more at  <a href="https://www.planetary.org/planetary-radio/2022-john-grunsfeld-goodnight-oppy">https://www.planetary.org/planetary-radio/2022-john-grunsfeld-goodnight-oppy</a>

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.

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.

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 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, chief scientist for The Planetary Society, as they dive deep into the latest space news. The monthly Space Policy Edition takes you inside the DC beltway with Casey Dreier and Jack Kiraly to discuss the politics of space exploration in the US and advocacy actions you can take to support the missions that matter. Visit planetary.org/radio for the space trivia contest, an episode guide, and much more.

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 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, chief scientist for The Planetary Society, as they dive deep into the latest space news. The monthly Space Policy Edition takes you inside the DC beltway with Casey Dreier and Jack Kiraly to discuss the politics of space exploration in the US and advocacy actions you can take to support the missions that matter. Visit planetary.org/radio for the space trivia contest, an episode guide, and much more.

Astrophysicist, former astronaut and NASA associate administrator John Grunsfeld on human exploration of space and the science we will do there.

Scientist and Hubble Repairman John Grunsfeld

China’s Tianwen-2 spacecraft has successfully arrived at Kamoʻoalewa—a tiny, enigmatic "quasi-satellite" that dances along with Earth on its trek around the Sun. A fascinating scientific debate is heating up over this object's true identity: is it a standard, heavily space-weathered asteroid, or is it a long-lost chunk of our own Moon, violently blasted into space by an ancient impact? Tianwen-2 is on a mission to solve this cosmic identity crisis, and it is happening right now.

This week, we sit down with Andrew Jones, a contributing editor for The Planetary Society and a freelance space journalist covering China's rapidly accelerating lunar and planetary exploration programs. He takes us inside the mission to reveal how Tianwen-2 will attempt to hover and snatch samples from this mysterious world, what those pieces could teach us about our Solar System's history, and where China’s planetary ambitions are targeting next.

Then, Chief Scientist Bruce Betts joins us for What’s Up to look ahead at asteroid missions and moments on the horizon through the end of this decade, from a Hayabusa2 flyby of asteroid Torifune next month to the 2029 close approach of asteroid Apophis.

Discover more at: https://www.planetary.org/planetary-radio/2026-tianwen-2

China&rsquo;s Tianwen-2 spacecraft has successfully arrived at Kamoʻoalewa&mdash;a tiny, enigmatic "quasi-satellite" that dances along with Earth on its trek around the Sun. A fascinating scientific debate is heating up over this object's true identity: is it a standard, heavily space-weathered asteroid, or is it a long-lost chunk of our own Moon, violently blasted into space by an ancient impact? Tianwen-2 is on a mission to solve this cosmic identity crisis, and it is happening right now.
This week, we sit down with Andrew Jones, a contributing editor for The Planetary Society and a freelance space journalist covering China's rapidly accelerating lunar and planetary exploration programs. He takes us inside the mission to reveal how Tianwen-2 will attempt to hover and snatch samples from this mysterious world, what those pieces could teach us about our Solar System's history, and where China&rsquo;s planetary ambitions are targeting next.
Then, Chief Scientist Bruce Betts joins us for What&rsquo;s Up to look ahead at asteroid missions and moments on the horizon through the end of this decade, from a Hayabusa2 flyby of asteroid Torifune next month to the 2029 close approach of asteroid Apophis.
Discover more at: <a href="https://www.planetary.org/planetary-radio/2026-tianwen-2">https://www.planetary.org/planetary-radio/2026-tianwen-2</a>

China’s Tianwen-2 mission has arrived at the quasi-moon Kamoʻoalewa. We sit down with Planetary Society contributing editor and freelance space journalist Andrew Jones to explore what this ambitious sample-return mission could reveal about our Solar System's history.

Tianwen-2: China closes in on Kamoʻoalewa

This outstanding novella, “To Be Taught, If Fortunate” by award-winning science fiction author Becky Chambers, is a passionate argument for the human exploration of space and the wonders we will find there. Kirkus Reviews calls it, “An extraordinary picture of humanity among the stars.” Join host Mat Kaplan for a conversation with Becky in which her personal enthusiasm for space science matches that of her four wandering explorers. The very alien lifeforms they discover amplify their own, very human failings and triumphs. Questions submitted by The Planetary Society’s members were a valuable contribution to this live event presented in our member community.

Discover more at: https://www.planetary.org/planetary-radio/book-club-becky-chambers

This outstanding novella, &ldquo;To Be Taught, If Fortunate&rdquo; by award-winning science fiction author Becky Chambers, is a passionate argument for the human exploration of space and the wonders we will find there. Kirkus Reviews calls it, &ldquo;An extraordinary picture of humanity among the stars.&rdquo; Join host Mat Kaplan for a conversation with Becky in which her personal enthusiasm for space science matches that of her four wandering explorers. The very alien lifeforms they discover amplify their own, very human failings and triumphs. Questions submitted by The Planetary Society&rsquo;s members were a valuable contribution to this live event presented in our member community.
Discover more at:&nbsp;<a href="https://www.planetary.org/planetary-radio/book-club-becky-chambers">https://www.planetary.org/planetary-radio/book-club-becky-chambers</a>

Hugo and Locus-winning author Becky Chambers talks with Mat Kaplan about “To Be Taught, If Fortunate,” her outstanding novella. It’s a passionate plea for space science and exploration told across the interstellar journey of four equally passionate human voyagers. 

Book Club Edition: “To Be Taught, If Fortunate” with Becky Chambers

Saturn's moon Titan is one of the most Earth-like worlds in our Solar System, with a dense nitrogen atmosphere, weather cycles, methane rivers, and vast organic dune fields. It also happens to be the perfect place to fly a drone. NASA's Dragonfly mission is doing exactly that, sending a car-sized, nuclear-powered rotorcraft to explore Titan's surface starting in 2034. With just two years until launch, the team is deep in the work of making it happen.

This week, we're joined by two members of the Dragonfly team from the Johns Hopkins Applied Physics Laboratory. Felipe Ruiz is the mission's lead rotor engineer and mechanical implementation lead, responsible for designing the eight-rotor system that will carry Dragonfly across Titan's skies. Zibi Turtle is the mission's principal investigator, a planetary scientist whose career has spanned missions from Galileo to Cassini to Europa Clipper.

Together, they walk us through the engineering challenges of flying a thousand-kilogram rotorcraft in an alien atmosphere, how the team is testing and validating the design here on Earth, and what the spacecraft's instruments will look for on Titan's surface.

Then Bruce Betts, our chief scientist, joins us for What's Up, where we pay tribute to the Ingenuity Mars helicopter and the legacy of the first powered, controlled flight on another world.

Discover more at: https://www.planetary.org/planetary-radio/2026-engineering-of-dragonfly

Saturn's moon Titan is one of the most Earth-like worlds in our Solar System, with a dense nitrogen atmosphere, weather cycles, methane rivers, and vast organic dune fields. It also happens to be the perfect place to fly a drone. NASA's Dragonfly mission is doing exactly that, sending a car-sized, nuclear-powered rotorcraft to explore Titan's surface starting in 2034. With just two years until launch, the team is deep in the work of making it happen.
This week, we're joined by two members of the Dragonfly team from the Johns Hopkins Applied Physics Laboratory. Felipe Ruiz is the mission's lead rotor engineer and mechanical implementation lead, responsible for designing the eight-rotor system that will carry Dragonfly across Titan's skies. Zibi Turtle is the mission's principal investigator, a planetary scientist whose career has spanned missions from Galileo to Cassini to Europa Clipper.
Together, they walk us through the engineering challenges of flying a thousand-kilogram rotorcraft in an alien atmosphere, how the team is testing and validating the design here on Earth, and what the spacecraft's instruments will look for on Titan's surface.
Then Bruce Betts, our chief scientist, joins us for What's Up, where we pay tribute to the Ingenuity Mars helicopter and the legacy of the first powered, controlled flight on another world.
Discover more at: <a href="https://www.planetary.org/planetary-radio/2026-engineering-of-dragonfly">https://www.planetary.org/planetary-radio/2026-engineering-of-dragonfly</a>

NASA's Dragonfly mission is sending a car-sized, nuclear-powered rotorcraft to Saturn's moon Titan. Lead rotor engineer Felipe Ruiz and principal investigator Zibi Turtle from Johns Hopkins Applied Physics Laboratory join us to discuss the engineering of flight on Titan with just two years to launch.

Scientist and Hubble Repairman John Grunsfeld

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