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Artwork for Planetary Radio: Space Exploration, Astronomy and Science

Planetary Radio: Space Exploration, Astronomy and Science

The Planetary Society
NASA
Space Exploration
Planetary Society
Mars
Space Policy
Astrobiology
Europa Clipper
Artemis Program
James Webb Space Telescope
Spacex
Carl Sagan
Europa
Enceladus
Jupiter
Titan
Planetary Defense
Astronomy
Human Spaceflight
Dava Sobel
Moon

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 ... more

PublishesTwice weeklyEpisodes1371Founded21 years ago
Number of ListenersCategories
ScienceTechnology

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Artwork for Planetary Radio: Space Exploration, Astronomy and Science

Latest Episodes

Ninety years ago this Halloween, a group of Caltech graduate students hauled a small rocket motor into the Arroyo Seco near Pasadena and tried to fire it up. It didn’t go as planned, but that moment became the unofficial birthday of NASA’s Jet Propul... more

YouTube

On the night of Oct. 5, 1923, Edwin Hubble spotted a variable star in Andromeda from Mt. Wilson Observatory above Pasadena, California, proving that our galaxy is just one of countless others in the Universe. Now, California Rep. Judy Chu, co-chair o... more

YouTube

NASA’s Perseverance rover has driven farther than any other vehicle on another world. On Oct. 11, 2026, its odometer reached 45.22 kilometers (28.10 miles), passing the record Opportunity spent about 15 years setting. Perseverance did it in about fiv... more

YouTube

Every two years, The Planetary Society funds research through our STEP Grants (Science and Technology Empowered by the Public). This year, all three winning projects focus on small bodies in our Solar System, like asteroids and trans-Neptunian object... more

YouTube

Key Facts

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Recent Guests

Vandi Verma
Principal engineer and deputy section manager for mobility and robotics at NASA's Jet Propulsion Laboratory
NASA's Jet Propulsion Laboratory
Episode: How Perseverance drove itself into the record books
Nick Moskovitz
Astronomer at Lowell Observatory and principal investigator of a polarimeter project
Lowell Observatory
Episode: Meet the Winners of The Planetary Society’s 2026 STEP Grants
Ryan Hamilton
Head of instrumentation at Lowell Observatory and former instrument scientist for SOFIA's HAWC+
Lowell Observatory
Episode: Meet the Winners of The Planetary Society’s 2026 STEP Grants
Katie Breeland-Newcomb
Doctoral student at Northern Arizona University designing and testing a polarimeter
Northern Arizona University
Episode: Meet the Winners of The Planetary Society’s 2026 STEP Grants
Miguel Alarcón
Director of Scientific Operations at Light Bridges and creator of AsteroidDB
Light Bridges
Episode: Meet the Winners of The Planetary Society’s 2026 STEP Grants
Mike Kretlow
Astronomer at the German Center for Astrophysics and creator of CORA
German Center for Astrophysics
Episode: Meet the Winners of The Planetary Society’s 2026 STEP Grants
Leroy Chiao
Former NASA astronaut, engineer, and commander of the International Space Station
One Orbit
Episode: Book Club Edition: Dinner With an Astronaut by Leroy Chiao
Asa Stahl
Public outreach astronomer at The Planetary Society
The Planetary Society
Episode: From the Mojave to Phobos: PlanetVac rides with MMX
Kris Zacny
Vice president and senior research scientist at Honeybee Robotics
Honeybee Robotics
Episode: From the Mojave to Phobos: PlanetVac rides with MMX

Hosts

Sarah Al-Ahmed
Space science communicator and host at The Planetary Society
Mat Kaplan
Science communicator and former Planetary Society senior communications advisor

Reviews

4.8 out of 5 stars from 2.2k ratings
  • Thank you!!

    This is a great podcast and should be much appreciated by everyone and I hope you all are doing good.

    Apple Podcasts
    5
    Kiwi/NZer
    New Zealand20 days ago
  • Best space science and space policy podcast. And a great organization to support.

    Podcast Addict
    5
    Crotach
    23 days ago
  • Simply spectacular journalism

    Planetary Radio is fascinating, informative, and engaging science journalism at its best. Sarah Al-Ahmed, like her predecessor, delivers in equal parts, enthusiasm, curiosity, and information. Deep gratitude for this contribution to scientific journalism. Keep crushing it, Sarah.

    Apple Podcasts
    5
    idinestridi
    United States2 months ago
  • Ad Astra for Real

    Planetary Radio is the most hopeful, and the most humane, place on the internet. Every episode gives us a chance to feel connected, included, and welcomed, whoever we may be or wherever we may be coming from. Every episode gives us a chance to experience awe. This is what it means to be one human family, headed inexorably Ad Astra. I am so grateful for the weekly reminder of what we can be when we're at our best and doing great things together <3

    Apple Podcasts
    5
    yuhfdfbged
    United States10 months ago
  • Excellent podcast

    Fascinating topics given by enthusiastic hosts. Could listen all day to programs like this!

    Apple Podcasts
    5
    I’m they
    Canada10 months ago

Listeners Say

Key themes from listener reviews, highlighting what works and what could be improved about the show.

Listeners praise Sarah Al-Ahmed's enthusiasm, preparation, thoughtful questions, and welcoming interview style.
Many describe the science and space coverage as fascinating, informative, inspiring, and well produced.
A minority criticize perceived political or corporate bias, and one review reports an audio-processing problem.
Some prefer a stronger focus on science and space news over personal reflections or lighter segments.
Listeners value the accessible updates on planetary science, NASA missions, astronomy, and exploration.

Chart Rankings

How this podcast ranks in the Apple Podcasts, Spotify and YouTube charts.

Apple Podcasts
#76
United States/Science
Apple Podcasts
#89
Canada/Science
Apple Podcasts
#138
United Kingdom/Science
Apple Podcasts
#138
Australia/Science
Apple Podcasts
#140
Italy/Science
Apple Podcasts
#73
Finland/Science

Talking Points

Recent interactions between the hosts and their guests.

How Perseverance drove itself into the record books
Q: Can you talk about the complexities of the sample collection and caching system itself?
Verma describes a carefully sequenced process that combines science decisions and engineering constraints: teams assess targets remotely and up close, abrade the rock, collect a core, inspect and document it, then use an internal robotic system to characterize and seal the sample for future return.
How Perseverance drove itself into the record books
Q: Could you give us the little speech that explains how rover driving doesn't exactly work like using a joystick or a steering wheel?
Communication between Earth and Mars takes four to 24 minutes one way, so teams plan a full Martian-day drive in advance, then use returned images to plan the next drive.
Meet the Winners of The Planetary Society’s 2026 STEP Grants
Q: What are the biggest gaps there that you're trying to fill with your upcoming AsteroidDB?
Researchers lack a shared place to collect and work with asteroid characterization measurements. AsteroidDB aims to aggregate photometry and let users combine, compare, and contribute data.
Meet the Winners of The Planetary Society’s 2026 STEP Grants
Q: What makes it so hard for us to figure out specifically the size of these asteroids from the ground?
Telescopes often see asteroids only as points of light, and brightness alone cannot distinguish a small, reflective object from a larger, darker one. Polarimetry can help estimate surface reflectivity and reduce that size uncertainty.
From the Mojave to Phobos: PlanetVac rides with MMX
Q: How do they actually do this sampling?
MMX uses a coring device and P-Sampler, a PlanetVac descendant that blows nitrogen gas to lift surface material into a collection chamber. Its design uses few moving parts, and its Phobos configuration counters thrust with upward-pointing nozzles.

Audience Metrics

Listeners, social reach, demographics and more for this podcast.

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Frequently Asked Questions About This Podcast

What is This Podcast about and what kind of topics does it cover?

Weekly conversations connect space science with the people, engineering, and policy behind exploration. Sarah Al-Ahmed leads interviews with planetary scientists, astronauts, engineers, researchers, advocates, and authors, while recurring features add context on missions, space history, and astronomy. Book Club editions bring authors into discussions of topics such as human spaceflight and the possibility of life beyond Earth, and Space Policy editions examine how funding, commercial models, and government decisions shape research and exploration.

The focus ranges across planetary missions, astronomy, small bodies, space technology, human spaceflight, and the future of exploration. Technical ideas are explained through firsthand accounts f... more

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These podcasts share a similar audience with this podcast:

1. Universe Today Podcast
2. Astronomy Cast
3. The Supermassive Podcast
4. SpaceTime with Stuart Gary
5. Space Nuts: Astronomy Insights & Cosmic Discoveries

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this podcast launched 21 years ago and published 1371 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

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What guests have appeared on this podcast?

Recent guests on this podcast include:

1. Vandi Verma
2. Nick Moskovitz
3. Ryan Hamilton
4. Katie Breeland-Newcomb
5. Miguel Alarcón
6. Mike Kretlow
7. Leroy Chiao
8. Asa Stahl

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