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. The full show archive is available for free.

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Dwarf Planet Ceres Thrills as a Dying Visitor Closes In

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

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

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

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

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

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

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

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

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

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?

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

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.

Planetary Radio Live! – Celebrating Curiosity on Mars

Join us for an utterly fascinating live conversation with Emily Lakdawalla about her brand new book, The Design and Engineering of Curiosity: How the Mars Rover Performs Its Job. Also joining us at Caltech were Curiosity Project Scientist Ashwin Vasavada and JPL Research Scientist Abigail Fraeman.

Yuri’s Night 2018!

Host Mat Kaplan once again attends the worldwide party for space. Join him at the Los Angeles celebration under Space Shuttle Endeavour.

Visiting the Earth-Like Worlds of TRAPPIST-1

We have begun to understand the composition of worlds that are hundreds of trillions of kilometers from Earth. Astronomer Nikole Lewis is co-leader of a team that has used the Hubble Space Telescope to do this with the four Earth-like planets circling a star called TRAPPIST-1.

Space Policy Edition: Lori Garver on what a NASA Administrator (and Deputy) actually does

Lori Garver, former Deputy Administrator of NASA, talks with Casey about what the Deputy and Administrator jobs are like day-to-day, how decisions actually get made at the top, and why the current lack of confirmed leadership hurts the space agency.

AI, Space, and Humanity’s Future—A Conversation with David Brin

The multi-award winning science fiction author, futurist and speaker returns to Planetary Radio for a wide-ranging conversation about robots and humans in space, empathetic artificial intelligences, how we can survive the Singularity and much more.

A Space Station Crashes to Earth

By the time you hear this week’s episode, China’s Tiangong-1 may have spectacularly re-entered our planet’s atmosphere, raining metal on an unpredictable location.

Stephen Hawking: Spaceflight Pioneer!

He is known for his breakthrough physics and popularizing of science, but Dr. Hawking also wanted to fly in space. Erik Viirre led the medical team that helped Stephen experience weightlessness.

Amateur Astronomers Work To Save Earth From Asteroids!

Seven astronomers have been selected to receive Shoemaker NEO (Near Earth Object) grants from the Planetary Society. They and their observatories span the planet. We’ll meet an American and an Australian. Society Chief Scientist Bruce Betts provides an overview of the grant program and later returns for this week’s edition of What’s Up. The Planetary Society’s Kate Howells reports on the outlook for space funding in Canada’s newly-released federal budget. She and Society CEO Bill Nye also met with Prime Minister Justin Trudeau.

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