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Planetary Radio Episodes

For every week since 2002, Planetary Radio has visited with a scientist, engineer, project manager, advocate or writer who provides a unique perspective on the quest for knowledge about our solar system and beyond. We also showcase regular features that raise your space IQ while they put a smile on your face.

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Giving Mysterious Venus the Love (and Science) She Deserves

August 15, 2018 • 55:54

We have so much to learn about Venus, says JPL scientist Sue Smrekar. What we learn will help us understand our own world and Mars.

Dark Energy’s Co-Discoverer and the Leader of Chinese Space Science

August 08, 2018 • 39:25

It has been 20 years since we learned the expansion of the universe is accelerating due to the mysterious force called dark energy. Saul Perlmutter shared the Nobel Prize in Physics because of his contributions.

Space Policy Edition: Destination…Mars? Contradictions and Principles

August 03, 2018 • 60:02

The Senate just held a hearing on NASA's efforts to send humans to...Mars? A week later, the same committee advanced legislation to extend the life of the International Space Station to 2030, six years beyond the current end-date and two years beyond the current hardware safety ratings.

Diving Into That Lake on Mars

August 01, 2018 • 47:34

Our world was rocked by last week’s announcement of good radar evidence for a liquid water “lake” under the Red Planet’s south pole. Senior Editor Emily Lakdawalla introduces us to the story that is then taken up by two of host Mat Kaplan’s favorite Martians. The Goddard Space Flight Center’s James Garvin headed NASA’s Mars exploration program, while NASA Ames astrobiologist Chris McKay co-founded the Mars Underground more than 35 years ago.

Hayabusa2 Reaches a Dark Diamond in Space

July 25, 2018 • 53:21

Japan’s Hayabusa2 is just 6 kilometers from asteroid Ryugu as it prepares to snatch samples of the space rock for return to Earth. ISAS/JAXA Director General and former Hayabusa Mission Project Manager Hitoshi Kuninaka joins us for a conversation about the spacecraft and what’s ahead.

An African Observatory Hunts Killer Asteroids

July 18, 2018 • 42:55

One of the Planetary Society’s 2018 Shoemaker Near-Earth Object grants has gone to astronomers searching the sky from a mountaintop in the North African nation of Morocco.

Something Old and Something New: Exciting Research on the International Space Station

July 11, 2018 • 50:45

Sextants have helped sailors find their way across oceans for centuries. Now one is onboard the International Space Station so that astronauts can learn to find their way across the solar system even if other technologies fail.

Space Policy Edition: Space Force! With Special Guest Brian Weeden

July 06, 2018 • 1:46:33

President Trump recently ordered the creation of Space Force—but what does that mean? What are the implications for militarization of space? National security expert Dr. Brian Weeden joins the show to explain the announcement.

Dwarf Planet Ceres Thrills as a Dying Visitor Closes In

July 04, 2018

Ceres is the queen of the asteroid belt. Her first Earthly visitor is nearing its last days in spectacular style. Dawn Mission Director and Chief Engineer Marc Rayman returns with stunning images taken from just 35 kilometers or 22 miles above the dwarf planet, and a preview of the spacecraft’s last days.

It’s Asteroid Week with NASA’s Planetary Defense Officer

June 27, 2018 • 40:44

The dinosaurs regret their lack of a space program. 200 million years later, humans are gearing up to defend themselves from a species-ending rock.

Kathryn Sullivan, Space Dentistry and More at the International Space Development Conference

June 20, 2018 • 45:51

Freeman Dyson wasn’t the only space star at the ISDC. Mat talks with former astronaut and NOAA Administrator Kathryn Sullivan, leaders of the Cassini mission, innovative students and an expert on dental care in space.

A Conversation with Freeman Dyson

June 13, 2018 • 39:38

There’s so much more to Freeman Dyson than the Dyson Sphere. The mathematician, physicist, futurist and author is one of the greatest and most original minds of our era.

It’s Rocket Science: Testing PlanetVac in the Mojave Desert

June 06, 2018 • 48:59

Join Mat Kaplan in California’s Mojave Desert for special coverage of not one but two rocket flights and a real world test of PlanetVac, the innovative, radically simple way to collect surface samples from other worlds.

Space Policy Edition: Space Policy Directive 2—This Time it's Commercial

June 01, 2018 • 1:11:49

President Trump just signed a new space policy directive targeting the regulations surrounding commercial spaceflight. Casey Dreier, Jason Callahan, and Mat Kaplan dive into the implications of the new directive and what it means for the relationship between government and space. They also break down all of the good news in the House's new funding bill for NASA, and highlight NASA Administrator Jim Bridenstine's turnaround on climate change.

A Sacred Place: The National Air and Space Museum with Ellen Stofan

May 30, 2018 • 35:00

Planetary geologist Ellen Stofan has just become Director of the most popular museum in the United States. The NASM protects and shares the greatest collection of space and aviation treasures on Earth.

Chasing New Horizons to Pluto with Alan Stern and David Grinspoon

May 23, 2018 • 54:41

The New Horizons mission was a triumph, revealing Pluto as an utterly unique and beautiful world. But the mission first had to survive challenge after challenge, fighting to be developed, meeting a nearly impossible launch deadline, and then narrowly avoiding disaster when it was barely a week from its destination.

Why Mars? We’ve Got the Answers

May 16, 2018 • 38:54

The great adventure awaits! Mat Kaplan hosts an entertaining panel discussion at the 2018 Humans to Mars Summit in Washington DC. Eight guests provide their diverse and inspiring reasons for humans to visit the Red Planet.

Amy Mainzer: Asteroid Hunter

May 09, 2018 • 36:21

After taking over 10 million images of more than 30,000 solar system objects, the NEOWISE mission is finally in its last months. Principal Investigator Amy Mainzer returns with an update on this phenomenal success and a look ahead toward a much more powerful asteroid and comet hunter called NEOCam.

Space Policy Edition: A Commercial Future for the Space Station?

May 04, 2018 • 1:03:03

After announcing it intends to divest from the International Space Station in 2025, NASA quietly released a new report on its transition plans, laying out a series of principles that will set the future of U.S. astronauts in low-Earth orbit. Can a private entity really take over the space station? Where did this idea come from anyway?

All Shook Up: The InSight Mission to Mars

May 02, 2018 • 1:21:50

No mission to Mars has done what InSight will do. The lander’s spectacularly sensitive instruments will use the Red Planet’s heat and marsquakes to reveal its deep interior while also revealing secrets of other rocky worlds like our own Earth.

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