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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Crew Dragon Thrills While Mars Chills

After a special message we present highlights of the successful arrival at the International Space Station of the Crew Dragon spacecraft, followed by a visit to chilly Mars with planetary scientist Edgard Rivera-Valentin.

NASA Administrator James Bridenstine Returns

The U.S. space agency’s leader describes how NASA is responding to the pandemic crisis as it works to keep projects and missions on track.

Exploring Venus, Earth's Mysterious Sister Planet

Astrophysicist Javier Peralta, a team member on Japan's Akatsuki mission, takes us deep into Venus's thick, fast-moving clouds.

Space Policy Edition: Why Apollo Ended (with John Logsdon)

As NASA struggles to return humans to the Moon by 2024, it's worth asking: why did it stop in the first place? Space historian John Logsdon joins the show to discuss the politics behind the decision to abandon the Moon in 1972. Casey and Mat also discuss the proposal to offer a $2 billion prize for sending humans back to the Moon and establishing a base there, and why that's not good public policy.

NASA’s Red Planet Rick and Putting Humans on Mars

Rick Davis is the perfect person to co-lead NASA’s Mars Human Landing Sites Study. No one is more devoted to putting human bootprints on the Red Planet. He returns to Planetary Radio for this inspiring and informative conversation about our progress. Bruce Betts leads off What’s Up with another brief LightSail 2 update. The Planetary Society’s solar sailing cubesat continues to raise its orbit.

Reflections of Humanity in a Spacesuit for Moonwalkers

Host Mat Kaplan in a long and fascinating conversation with Nicholas de Monchaux, author of Spacesuit: Fashioning Apollo. This great book is about much more than creation of the suits that allowed humans to walk and work on the Moon. Jason Davis shares pointers on looking for LightSail 2 overhead, while Bruce Betts provides a solar sail update in this week’s What’s Up. And you might win a Planetary Radio t-shirt!

Space Policy Edition: The Home Front During Apollo (with Emily Margolis)

Did the public support Project Apollo? Dr. Emily Margolis joins the show to explore the domestic politics and cultural impact of the space age throughout the 1960s. Despite the success of the lunar landings, there was more opposition to Apollo than we generally remember.

A Political History of Apollo Episode 5 - A Gift or a Curse?

In the final episode, producer Mat Kaplan joins Casey to reflect on the lessons and legacy of Apollo. Was it a burden on the space program or a gift for future generations? What can we take away from this single data point of humans walking on another world? And what should we be wary of?

A Political History of Apollo Episode 4 - Why it Ended

After more than a decade's worth of work and billions of dollars spent, the United States could send humans to the surface of the Moon whenever it wanted. But after landing only six times, the country just walked away, closing down production lines, laying off tens of thousands of workers, and committing humans to low-Earth orbit seemingly indefinitely. Why did it end? And was this inevitable?

Apollo 11 and the Woman Who Helped Get It Home

Poppy Northcutt was a pioneer—the first woman to work as an engineer in Apollo Mission Control. The program she helped to create got the astronauts back to Earth. Fifty years later, she sits down with Mat Kaplan for a look back.

A Political History of Apollo Episode 3 - The Home Front

In 1964, 40% of the public did not approve of Project Apollo, and more than 50% did not think the moon shot was "worth the cost" throughout the 1960s. Kennedy himself questioned the commitment and considered cooperating—instead of competing—with the Soviet Union in space. At the same time, there was an explosion of space-related pop culture and citizen engagement with the space race. Dr. Emily Margolis, whose dissertation was titled Space Travel at 1G: Space Tourism in Cold War America, joins the show to explore the complicated politics of the home front during Project Apollo.

A Political History of Apollo Episode 2 - The Soviet Moonshot

The Soviet space program launched the first artificial satellite, the first man, and the first woman into space. Soviet cosmonauts performed the first spacewalk and piloted the first two-person spacecraft. But it was the United States that placed the first humans on the surface of the Moon. What happened? Dr. Asif Siddiqi, author of Challenge to Apollo: The Soviet Union and the Space Race (PDF Download), helps answer that question.

Space Policy Edition: Why Apollo Happened (with Roger Launius)

Space historian Dr. Roger Launius joins the show to explain why Apollo happened the way it did, how a moonshot briefly became a solution to a national security problem, and why it is unlikely to happen again.

A Political History of Apollo Episode 1 - Why It Happened

When President Kennedy announced Project Apollo, the United States was locked in a global ideological conflict with the Soviet Union. But how did the idea of a Moon shot come to be the answer to a political problem? And why did it happen when it did? Dr. Roger Launius, former Chief Historian of NASA and currently the Principal at Launius Historical Services, explains why Apollo happened and where it came from. His latest book, Apollo's Legacy: Perspectives on the Moon Landings is available now.

Sharing a Passion for Mars at the Humans to Mars Summit

This year’s Humans to Mars Summit in Washington D.C., once again ended with a panel of Martian all-stars talking about their hopes for a future that includes the Red Planet. Planetary Radio host Mat Kaplan leads the inspiring and entertaining discussion.

Space Policy Edition: T-minus Five Years and Counting

Can NASA return astronauts to the Moon by 2024? Vice President Mike Pence shocked the space community by announcing this ambitious new goal just weeks after the Trump Administration proposed a half-billion dollar cut to the space agency.

Bill Nye and Planetary Radio Live at Extreme STEAM

Planetary Radio Live goes on stage at the first ever Fairplex Extreme STEA2M Festival in Pomona, California. Host Mat Kaplan and Planetary Society CEO Bill Nye are joined by four young space scientists and engineers in front of hundreds of families.

Boosters, Breakthroughs and Budgets: Canada and the US Look Toward Space

The last few days have seen developments that will shape the space exploration plans of Canada and the USA. The Planetary Society’s Kate Howells is a member of Canada’s Space Advisory Board. She reviews the nation’s new space policy.

Space Policy Edition: When a (Space) Cowboy Came to Washington

Historian John Logsdon discusses his new book, Ronald Reagan and the Space Frontier It explores the legacy of the 40th president’s major space policy decisions. We look at four major topics: early efforts at commercializing space, the survival crisis for planetary exploration, the Space Shuttle, and the decision to build the space station.

Earthrise! Celebrating the 50th Anniversary of Apollo 8

This is the 50th anniversary of the most audacious space mission in history. Apollo 8 blazed a path for the first moon landing seven months later, and gave a troubled nation reason for hope and pride.

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