It started with a question from a listener. The answer comes from Dawn mission chief engineer and mission director Marc Rayman. Marc also tells us about his new job as chief engineer for mission operations and science at NASA’s Jet Propulsion Laboratory, and shares his love of space exploration with Mat. LightSail 2 is still going strong! Program manager Bruce Betts opens this week’s What’s Up segment with a mission status report. Learn more at https://www.planetary.org/planetary-radio/2021-mark-rayman-dawn-ceres

It started with a question from a listener. The answer comes from Dawn mission chief engineer and mission director Marc Rayman. Marc also tells us about his new job as chief engineer for mission operations and science at NASA&rsquo;s Jet Propulsion Laboratory, and shares his love of space exploration with Mat. LightSail 2 is still going strong! Program manager Bruce Betts opens this week&rsquo;s What&rsquo;s Up segment with a mission status report. Learn more at <a href="https://www.planetary.org/planetary-radio/2021-mark-rayman-dawn-ceres">https://www.planetary.org/planetary-radio/2021-mark-rayman-dawn-ceres</a>

Planetary Radio brings you the human adventure across our Solar System and beyond. We visit each week with the scientists, engineers, leaders, advocates, and astronauts who are taking us across the final frontier. Regular features raise your space IQ while they put a smile on your face. Join host Sarah Al-Ahmed and Planetary Society colleagues including Bill Nye the Science Guy and Bruce Betts as they dive deep into space science and exploration. The monthly Space Policy Edition takes you inside the DC beltway where the future of the US space program hangs in the balance. Visit planetary.org/radio for an episode guide and much more.

Planetary Radio brings you the human adventure across our Solar System and beyond. We visit each week with the scientists, engineers, leaders, advocates, and astronauts who are taking us across the final frontier. Regular features raise your space IQ while they put a smile on your face. Join host Sarah Al-Ahmed and Planetary Society colleagues including Bill Nye the Science Guy and Bruce Betts as they dive deep into space science and exploration. The monthly Space Policy Edition takes you inside the DC beltway where the future of the US space program hangs in the balance. Visit planetary.org/radio for an episode guide and much more.

Planetary Radio: Space Exploration, Astronomy and Science

Planetary Radio brings you the human adventure across our solar system and beyond. We visit each week with the scientists, engineers, leaders, advocates, and astronauts taking us across the final frontier. Regular features raise your space IQ while they put a smile on your face. Join host Sarah Al-Ahmed and Planetary Society colleagues including Bill Nye, the Science Guy, and Bruce Betts, chief scientist for The Planetary Society, as they dive deep into the latest space news. The monthly Space Policy Edition takes you inside the DC beltway with Casey Dreier and Jack Kiraly to discuss the politics of space exploration in the US and advocacy actions you can take to support the missions that matter. Visit planetary.org/radio for the space trivia contest, an episode guide, and much more.

Planetary Radio brings you the human adventure across our solar system and beyond. We visit each week with the scientists, engineers, leaders, advocates, and astronauts taking us across the final frontier. Regular features raise your space IQ while they put a smile on your face. Join host Sarah Al-Ahmed and Planetary Society colleagues including Bill Nye, the Science Guy, and Bruce Betts, chief scientist for The Planetary Society, as they dive deep into the latest space news. The monthly Space Policy Edition takes you inside the DC beltway with Casey Dreier and Jack Kiraly to discuss the politics of space exploration in the US and advocacy actions you can take to support the missions that matter. Visit planetary.org/radio for the space trivia contest, an episode guide, and much more.

The ion engine-powered Dawn spacecraft will orbit Ceres for many years. Could it have touched down on the surface of the dwarf planet?

Why didn’t Dawn land on dwarf planet Ceres?

We tend to think of private space exploration as a recent phenomenon. But as Alex MacDonald, former Chief Economist at NASA, argues in his book "The Long Space Age," privately funded space exploration has deep roots in American history, stretching back more than two centuries.

In this 2017 conversation with The Planetary Society's Chief of Space Policy Casey Dreier, originally aired on the Space Policy Edition of Planetary Radio, MacDonald traces the economic history of American space exploration from the 1769 transit of Venus all the way to the present day, and makes the case that the government-dominated model we grew up with may actually be the historical anomaly.

Discover more at: https://www.planetary.org/planetary-radio/long-space-age

We tend to think of private space exploration as a recent phenomenon. But as Alex MacDonald, former Chief Economist at NASA, argues in his book "The Long Space Age," privately funded space exploration has deep roots in American history, stretching back more than two centuries.
In this 2017 conversation with The Planetary Society's Chief of Space Policy Casey Dreier, originally aired on the Space Policy Edition of Planetary Radio, MacDonald traces the economic history of American space exploration from the 1769 transit of Venus all the way to the present day, and makes the case that the government-dominated model we grew up with may actually be the historical anomaly.
Discover more at: <a href="https://www.planetary.org/planetary-radio/long-space-age">https://www.planetary.org/planetary-radio/long-space-age</a>

Alex MacDonald, former Chief Economist at NASA and author of "The Long Space Age," joins Casey Dreier to explore more than two centuries of privately funded space exploration in America.

Space Policy Edition: The Long Space Age with Alex MacDonald

Dennis Stone, president and co-founder of the World Space Week Association, takes us behind the scenes of the largest annual space event on Earth. From its origins as a volunteer effort in Houston to a UN-declared celebration reaching 50,000 events in over 100 countries, Dennis shares how World Space Week inspires the next generation, and how you can get involved this Oct. 4 through 10. Then, Science Editor Asa Stahl breaks down the end of the Neil Gehrels Swift Observatory, the 21-year-old space telescope that's falling out of orbit after a bold rescue mission fell short. Plus, Chief Scientist Bruce Betts looks back at a milestone centennial in this week's What's Up, 100 years since Robert Goddard launched the world's first liquid-fueled rocket.

Discover more at: https://www.planetary.org/planetary-radio/2026-world-space-week-and-swift

Dennis Stone, president and co-founder of the World Space Week Association, takes us behind the scenes of the largest annual space event on Earth. From its origins as a volunteer effort in Houston to a UN-declared celebration reaching 50,000 events in over 100 countries, Dennis shares how World Space Week inspires the next generation, and how you can get involved this Oct. 4 through 10. Then, Science Editor Asa Stahl breaks down the end of the Neil Gehrels Swift Observatory, the 21-year-old space telescope that's falling out of orbit after a bold rescue mission fell short. Plus, Chief Scientist Bruce Betts looks back at a milestone centennial in this week's What's Up, 100 years since Robert Goddard launched the world's first liquid-fueled rocket.
Discover more at: <a href="https://www.planetary.org/planetary-radio/2026-world-space-week-and-swift">https://www.planetary.org/planetary-radio/2026-world-space-week-and-swift</a>

Dennis Stone, president and co-founder of the World Space Week Association, shares how the largest annual space event on Earth came to be and how you can join the celebration this October. Plus, Science Editor Asa Stahl walks us through the final chapter of the Swift space telescope.

World Space Week and farewell to Swift

After decades of development, the Nancy Grace Roman Space Telescope is preparing to launch. Once in orbit, Roman will conduct the widest surveys of the universe ever attempted, probing the nature of dark energy, discovering thousands of new exoplanets, and capturing images of billions of galaxies. In this episode, we sit down with Julie McEnery, senior project scientist for Roman at NASA's Goddard Space Flight Center, and Jason Rhodes, project scientist for Roman at NASA’s Jet Propulsion Laboratory, to explore what the telescope will reveal and how scientists around the world will be able to access and work with its data. Plus, in What's Up, we look at Roman's coronagraph and what it will take for the Habitable Worlds Observatory to push that technology far enough to image Earth-like worlds around Sun-like stars.

Discover more at: https://www.planetary.org/planetary-radio/2026-nancy-grace-roman

After decades of development, the Nancy Grace Roman Space Telescope is preparing to launch. Once in orbit, Roman will conduct the widest surveys of the universe ever attempted, probing the nature of dark energy, discovering thousands of new exoplanets, and capturing images of billions of galaxies. In this episode, we sit down with Julie McEnery, senior project scientist for Roman at NASA's Goddard Space Flight Center, and Jason Rhodes, project scientist for Roman at NASA&rsquo;s Jet Propulsion Laboratory, to explore what the telescope will reveal and how scientists around the world will be able to access and work with its data. Plus, in What's Up, we look at Roman's coronagraph and what it will take for the Habitable Worlds Observatory to push that technology far enough to image Earth-like worlds around Sun-like stars.
Discover more at: <a href="https://www.planetary.org/planetary-radio/2026-nancy-grace-roman">https://www.planetary.org/planetary-radio/2026-nancy-grace-roman</a>

The Nancy Grace Roman Space Telescope is preparing to launch, promising to transform our understanding of dark energy and exoplanets. We talk with Julie McEnery, senior project scientist for Roman at NASA Goddard, and Jason Rhodes, project scientist for Roman at JPL, about what's ahead.

Why didn’t Dawn land on dwarf planet Ceres?

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