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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Amy Mainzer and a New Asteroid-Hunting Space Telescope

NASA has approved development of the NEO Surveyor space telescope. Project lead Amy Mainzer shares her hopes for this vital planetary defense tool.

Space Policy Edition: The Pentagon's UFO Report, Featuring Sarah Scoles

The Pentagon has released its assessment of Unidentified Aerial Phenomena. Casey Dreier and science journalist Sarah Scoles talk about what’s behind the renewed interest in UFOs and Sarah’s book, They Are Already Here.

Finding Life by Looking for Complexity

University of Glasgow chemist Lee Cronin believes he and his collaborators have found a way to recognize life as we know it and as we don’t know it.

The Pearly Clouds of Mars

Atmospheric scientist Mark Lemmon discusses the beautiful clouds on Mars imaged by NASA's Curiosity rover.

Amateur Astronomers Saving the World

Planetary Society grants have enabled amateur astronomers to discover and track asteroids that cross Earth’s path. We’ll meet two of them.

The New Great Space Observatories

Astrophysicist Grant Tremblay describes how four proposed space telescopes could reveal our solar system and the universe as never before.

Defenders of Earth on Planetary Radio

Six planetary defense leaders report on progress toward protecting Earth from near-Earth objects.

Space Policy Edition: How Starship at the Moon Brings NASA Closer to Mars

NASA chose SpaceX’s Starship as the sole winner of its human lunar lander development contract in a move that may also take us closer to Mars.

The High Frontier: A New Documentary About Gerard K. O’Neill

Gerard K. O’Neill envisioned vast, magnificent human settlements in space. His followers, including Jeff Bezos, are working to turn his vision into reality.

The First Space Shuttle Pilot: Bob Crippen on the 40th Anniversary of STS-1

Robert Crippen and John Young became the first humans to fly a space shuttle into orbit when Columbia launched on April 12, 1981.

InSight’s Mole: A Martian Science Odyssey

NASA engineer and scientist Troy Hudson shares the sad but ultimately inspiring story of a two-year attempt to dig deep beneath the surface of Mars.

Space Policy Edition: SpaceX's Early, Desperate Days (with Eric Berger)

Elon Musk’s SpaceX nearly failed 15 years ago as it struggled to launch its first rocket. Eric Berger has written about this challenging early era and how it helped create today’s successful, innovative company.

Spinoffs: How NASA Technologies Benefit Life on Earth

We examine a few of the thousands of technologies and innovations developed by NASA that are making lives better around our planet.

A Symphony for 7 Moons

Composer Amanda Lee Falkenberg is joined by Cassini project scientist Linda Spilker and retired astronaut Nicole Stott as she shares excerpts from The Moons Symphony.

Solar Cruiser: A Giant Sail Prepares for Space

NASA has given the green light to Principal Investigator Les Johnson and his team for construction of a solar sail that dwarfs all that have come before.

Astronaut Stephanie Wilson Might Walk on the Moon

18 astronauts on the Artemis Team have a shot at walking on the Moon, and Stephanie Wilson is one of them.

More Moon Water and an Update from Venus on Our 18th Anniversary!

Astronomer Jane Greaves returns with an update on the phosphine gas floating above Venus, before Casey Honnibal takes us through her team’s discovery of water right out under the Sun on Earth’s Moon.

A Deep Dive into Asteroid Bennu With Dante Lauretta

The leader of the OSIRIS REx asteroid sample return mission shares more details of last week’s encounter in an exclusive interview, while we also learn about the proposed mission to look for life on Saturn’s moon Enceladus.

Protectors of Earth! (and Other Worlds)

NASA’s planetary protection officer joined Mat Kaplan’s Humans to Mars summit panel for a great conversation about protecting worlds throughout the solar system from what could be devastating contamination.

Have We Found Evidence of Life on Venus?

It could be a profound and historic discovery made on Earth’s nearest planetary neighbor.

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