With Mat Kaplan in London for Planetary Radio Live, we bring back one of the most moving events in the history of our show. The Cassini orbiter plunged into Saturn in the early hours of September 15, 2017. Hundreds gathered to mark the end of this remarkable voyage, including former NASA chief scientists Jim Green, John Grunsfeld and Ellen Stofan. Mat talked with them and many others on that memorable morning. Then we’ll check in with Bruce Betts for a brand new What’s Up. Discover more at https://www.planetary.org/planetary-radio/2022-cassini-eom-reprise

With Mat Kaplan in London for Planetary Radio Live, we bring back one of the most moving events in the history of our show. The Cassini orbiter plunged into Saturn in the early hours of September 15, 2017. Hundreds gathered to mark the end of this remarkable voyage, including former NASA chief scientists Jim Green, John Grunsfeld and Ellen Stofan. Mat talked with them and many others on that memorable morning. Then we&rsquo;ll check in with Bruce Betts for a brand new What&rsquo;s Up. Discover more at <a href="https://www.planetary.org/planetary-radio/2022-cassini-eom-reprise">https://www.planetary.org/planetary-radio/2022-cassini-eom-reprise</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.

We were there when the spacecraft ended 13 years of exploration and revelation at Saturn.

Cassini’s Dramatic End: A Planetary Radio Reprise

The Los Angeles Astronomical Society (LAAS) is one of the oldest and largest amateur astronomy clubs in the United States, and this year, it’s turning 100. To mark the occasion, the LAAS threw a centennial star party on the lawn of Griffith Observatory, featuring 100 telescopes, a dedication ceremony, and a community of passionate skywatchers who showed up rain and all.

In this episode, we sit down with Laura-May Abron, vice president of the Los Angeles Astronomical Society and chair of its Centennial Committee, to discuss what it took to put together the event. We drop into the centennial dedication ceremony to hear from LAAS President Keith Armstrong and Griffith Observatory Director Ed Krupp. We also spend time with some of the remarkable members who make this community what it is, including LAAS historian Louis Chilton, who has been a member for over 60 years, research scientist and LAAS member Bryce Bolin, self-taught optician and telescope builder Jeff Schroeder, and Geo Somoza, volunteer at The Planetary Society and one of the people who has dedicated his life to showing others the sky. Plus, Bruce Betts joins us for What's Up and a look at what you can spot in the night sky in June.

Discover more at: https://www.planetary.org/planetary-radio/2026-laas-centennial 

The Los Angeles Astronomical Society (LAAS) is one of the oldest and largest amateur astronomy clubs in the United States, and this year, it&rsquo;s turning 100. To mark the occasion, the LAAS threw a centennial star party on the lawn of Griffith Observatory, featuring 100 telescopes, a dedication ceremony, and a community of passionate skywatchers who showed up rain and all.
In this episode, we sit down with Laura-May Abron, vice president of the Los Angeles Astronomical Society and chair of its Centennial Committee, to discuss what it took to put together the event. We drop into the centennial dedication ceremony to hear from LAAS President Keith Armstrong and Griffith Observatory Director Ed Krupp. We also spend time with some of the remarkable members who make this community what it is, including LAAS historian Louis Chilton, who has been a member for over 60 years, research scientist and LAAS member Bryce Bolin, self-taught optician and telescope builder Jeff Schroeder, and Geo Somoza, volunteer at The Planetary Society and one of the people who has dedicated his life to showing others the sky. Plus, Bruce Betts joins us for What's Up and a look at what you can spot in the night sky in June.
Discover more at: <a href="https://www.planetary.org/planetary-radio/2026-laas-centennial">https://www.planetary.org/planetary-radio/2026-laas-centennial</a>&nbsp;

The Los Angeles Astronomical Society is one of the oldest and largest amateur astronomy clubs in the United States, and this year it’s turning one hundred. We were there at Griffith Observatory for the centennial celebration to find out what keeps a community of skywatchers going for a century.

Los Angeles Astronomical Society celebrates 100 years of looking up

NASA's Curiosity rover has been exploring Mars' Gale Crater for over a decade. A new analysis of samples collected there reveals something remarkable: more than 20 different organic molecules preserved in ancient rock, including the first detection of a nitrogen-bearing heterocycle on Mars, a type of molecule that's a precursor to compounds essential for life as we know it.

While these molecules aren't evidence of life, they tell us that the chemical building blocks for life were present in ancient Martian environments. In this episode, we talk with Amy Williams, an astrobiologist and associate professor at the University of Florida, about what this discovery means for our understanding of Mars' habitability. Then, Planetary Society Chief Scientist Bruce Betts joins us for What's Up, where we compare the results to samples collected from asteroid Bennu.


Discover more at: https://www.planetary.org/planetary-radio/2026-diverse-organics-gale-crater-mars

NASA's Curiosity rover has been exploring Mars' Gale Crater for over a decade. A new analysis of samples collected there reveals something remarkable: more than 20 different organic molecules preserved in ancient rock, including the first detection of a nitrogen-bearing heterocycle on Mars, a type of molecule that's a precursor to compounds essential for life as we know it.
While these molecules aren't evidence of life, they tell us that the chemical building blocks for life were present in ancient Martian environments. In this episode, we talk with Amy Williams, an astrobiologist and associate professor at the University of Florida, about what this discovery means for our understanding of Mars' habitability. Then, Planetary Society Chief Scientist Bruce Betts joins us for What's Up, where we compare the results to samples collected from asteroid Bennu.
 Discover more at: <a href="https://www.planetary.org/planetary-radio/2026-diverse-organics-gale-crater-mars">https://www.planetary.org/planetary-radio/2026-diverse-organics-gale-crater-mars</a>

Amy Williams, astrobiologist and associate professor at the University of Florida, discusses a landmark experiment that revealed more than 20 organic molecules preserved in ancient Martian rock. We explore what this chemical discovery tells us about Mars' ancient habitability.

Twenty organic molecules found in an ancient Martian rock

Author, poet, and science communicator Diane Ackerman is our guest. Her wonderful collection of poems, with one devoted to each of the worlds in our Solar System, was first published in 1976. Carl Sagan said she had produced, “...a stunning book of poetry in The Planets. The work is scientifically accurate and even a convenient introduction to modern ideas on the planets, but much more important, it is spectacularly good poetry, clear, lyrical, and soaring. . . One of the triumphs of Ackerman’s pastoral is the demonstration of how closely compatible planetary exploration and poetry, science and art really are.” “The Planets” is now available in a brand new edition, and is as sublime, entertaining, and enlightening as it was half a century ago.


Discover more at: https://www.planetary.org/planetary-radio/book-club-diane-ackerman

Author, poet, and science communicator Diane Ackerman is our guest. Her wonderful collection of poems, with one devoted to each of the worlds in our Solar System, was first published in 1976. Carl Sagan said she had produced, &ldquo;...a stunning book of poetry in The Planets. The work is scientifically accurate and even a convenient introduction to modern ideas on the planets, but much more important, it is spectacularly good poetry, clear, lyrical, and soaring. . . One of the triumphs of Ackerman&rsquo;s pastoral is the demonstration of how closely compatible planetary exploration and poetry, science and art really are.&rdquo; &ldquo;The Planets&rdquo; is now available in a brand new edition, and is as sublime, entertaining, and enlightening as it was half a century ago.
 Discover more at: <a href="https://www.planetary.org/planetary-radio/book-club-diane-ackerman">https://www.planetary.org/planetary-radio/book-club-diane-ackerman</a>

Celebrated author and poet Diane Ackerman joins us for a lively conversation about the new edition of her wonderful collection. Carl Sagan described it as spectacularly good poetry.

Cassini’s Dramatic End: A Planetary Radio Reprise

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