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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Celebrating 30 Years of Hubble with Astronaut John Grunsfeld

Astrophysicist and former astronaut John “Hubble Repairman” Grunsfeld looks back over three decades of beautiful science and inspiration delivered by the Hubble Space Telescope.

The Crew Dragon Countdown Begins With Former NASA Deputy Administrator Lori Garver

American astronauts are about to fly from Florida to the International Space Station for the first time in nine years, thanks to the commercial space development initiative advocated for years by Lori Garver.

The Royal Astronomical Society at 200

Celebrating the 200th anniversary of the Royal Astronomical Society and the life of the late astronomer Margaret Burbidge.

The Unexpected Space Center: Los Alamos National Laboratory

This US research center has been part of more than 200 space missions, but it’s not a NASA facility! The Los Alamos National Laboratory in New Mexico gave the Voyager spacecraft their power sources, is building nuclear generators for future Martians, and accidentally invented the field of High Energy Astrophysics.

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.

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 Helicopter for Mars and a Major LightSail Announcement

It will be the first flying machine on another world. Mars Helicopter Project Manager MiMi Aung shares her plans. There’s big news about The Planetary Society’s LightSail 2!

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?

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.

Flight by Light: A LightSail 2 Mission Preview

The day is almost here. With the launch of a Falcon Heavy rocket, The Planetary Society will begin its mission to prove that a tiny, orbiting spacecraft can be propelled by the light of the Sun.

Space Policy Edition: The Soviet Moonshot (with Asif Siddiqi)

The U.S. won the space race in July of 1969 with the success of Apollo 11. But was the Soviet Union even racing? How close were they to beating the United States to the Moon?

Starchaser: Extraordinary Astronomer Jay Pasachoff

Jay Pasachoff visits Planetary Society headquarters for a conversation about the latest edition of his and Alex Filippenko’s monumental textbook The Cosmos.

Ice Worlds, A Moon Landing and Blasting an Asteroid

When will we return to Uranus and Neptune? Planetary scientist Amy Simon explains why a mission to the so-called ice giants is a high priority as she tells us about these mysterious, blue worlds.

China on the Final Frontier

With missions like Chang’e 4 on the far side of the Moon, China has firmly established itself as a leader in space exploration. Space journalist Andrew Jones helps us explore the nation’s ambitious near and long-term plans.

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.

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