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Rank #18 in Natural Sciences category

Technology
Science
Natural Sciences

Planetary Radio: Space Exploration, Astronomy and Science

Updated 6 days ago

Rank #18 in Natural Sciences category

Technology
Science
Natural Sciences
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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 Mat Kaplan and Planetary Society colleagues including Bill Nye the Science Guy, Bruce Betts, and Emily Lakdawalla as they dive deep into the latest space news. 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 the space trivia contest, an episode guide, and much more.

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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 Mat Kaplan and Planetary Society colleagues including Bill Nye the Science Guy, Bruce Betts, and Emily Lakdawalla as they dive deep into the latest space news. 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 the space trivia contest, an episode guide, and much more.

iTunes Ratings

678 Ratings
Average Ratings
622
22
17
7
10

Should be better than it is

By Zawfer - Nov 27 2019
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Whenever this comes into my feed, I read the description of the episode and look forward to hearing it because it sounds so interesting. But then I end up turning it off after a few minutes because the voice of the show, Mat Kaplan, is so annoying to listen to. He sounds like he was hired because he has an old-school radio announcer’s voice, all show business and insincerity. The podcast sounds like AM radio, cheesy and loud. Too bad, because the topic is so interesting.

Awesome podcast from an awesome organization

By SamTracy - Nov 20 2019
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So cool to hear straight from the thinkers & doers in the study & business of outer space. One of my all-time favorite podcasts.

iTunes Ratings

678 Ratings
Average Ratings
622
22
17
7
10

Should be better than it is

By Zawfer - Nov 27 2019
Read more
Whenever this comes into my feed, I read the description of the episode and look forward to hearing it because it sounds so interesting. But then I end up turning it off after a few minutes because the voice of the show, Mat Kaplan, is so annoying to listen to. He sounds like he was hired because he has an old-school radio announcer’s voice, all show business and insincerity. The podcast sounds like AM radio, cheesy and loud. Too bad, because the topic is so interesting.

Awesome podcast from an awesome organization

By SamTracy - Nov 20 2019
Read more
So cool to hear straight from the thinkers & doers in the study & business of outer space. One of my all-time favorite podcasts.

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Cover image of Planetary Radio: Space Exploration, Astronomy and Science

Planetary Radio: Space Exploration, Astronomy and Science

Updated 6 days ago

Read 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 Mat Kaplan and Planetary Society colleagues including Bill Nye the Science Guy, Bruce Betts, and Emily Lakdawalla as they dive deep into the latest space news. 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 the space trivia contest, an episode guide, and much more.

The Right Site: Choosing A Landing Spot on Mars

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The 2020 Mars Rover may be years away, but determining where it will land is already a hot topic among scientists and engineers. Many of the former gathered in early August for a site selection workshop. We talk with Co-Chair and Mars veteran Matt Golombek, JPL astrobiologist Lindsay Hays, and Ken Edgett of Malin Space Science Systems.Learn more about your ad choices. Visit megaphone.fm/adchoices

Aug 25 2015

33mins

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Imaging Hot Young Jupiters

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Franck Marchis is on the team that has delivered an actual image of a young, hot world about 100 light years from Earth. We talk with him on the 20th anniversary of the first exoplanet discovery.Learn more about your ad choices. Visit megaphone.fm/adchoices

Oct 06 2015

28mins

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How Long Was Mars Wet?

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Planetary scientist Briony Horgan and her team want to know how long liquid water flowed on the surface of the Red Planet before that world froze. Long enough for life to appear and thrive? New work comparing Earth’s extremes may have provided clues. There’s gas in space, and some of it is inside astronauts. Bruce Betts shares the uncomfortable truth in this week’s What’s Up. Also, space headlines from The Downlink. Learn more about this week’s guest and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/1023-2019-briony-horgan.html

Oct 23 2019

28mins

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Getting Humans to Mars Without Breaking the Bank

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NASA scientist Harley Thronson tells us about a new initiative that is figuring out how we will get men and women to the red planet at a reasonable price. You can read their initial report. Emily Lakdawalla reports on Curiosity’s passage over dunes that made engineers nervous. Bill Nye reveals NASA’s plans for a lunar rover that may launch in 2018. Mat Kaplan joins Bruce Betts in a TV studio to record this week’s What’s Up segment. You can watch!Learn more about your ad choices. Visit megaphone.fm/adchoices

Feb 18 2014

28mins

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From Earth to the Edge of the Universe: A New Edition of “The Cosmos”

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Astronomers Jay Pasachoff and Alex Filippenko join us for a conversation about their newest version of their monumental textbook, "The Cosmos." Emily Lakdawalla helps us say good morning to the just-awakened Rosetta spacecraft, while Bill Nye is fascinated and puzzled by what looks like a jelly doughnut on the Martian surface.Learn more about your ad choices. Visit megaphone.fm/adchoices

Jan 21 2014

30mins

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Why Mars? We’ve Got the Answers

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The great adventure awaits! Mat Kaplan hosts an entertaining panel discussion at the 2018 Humans to Mars Summit in Washington DC.  Eight guests provide their diverse and inspiring reasons for humans to visit the Red Planet.  Bruce Betts later joins Mat to explore the Demon Star.  Learn more about this week’s topic and see images here: http://www.planetary.org/multimedia/planetary-radio/show/2018/0516-h2m-why-mars-panel.htmlGuests include: Filmmaker Nicholas Agnew, creator of Seat 25Consultant Jeff Bingham, former NASA Associate Administrator for Legislative AffairsJim Garvin, Chief Scientist, Goddard Space Flight CenterJanet Ivey, Emmy award-winning creator of Janet’s Planet“Astronaut Abby” Abigail HarrisonKeri Kukral, Raw Science and the Raw Science Film FestivalSaralyn Mark, MD, iGiant founder and presidentArtemis Westenberg, Explore Mars president, director and co-founderLearn more about your ad choices. Visit megaphone.fm/adchoices

May 16 2018

38mins

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Dr. J and the World’s Biggest Telescope

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Joe Liske, host of Hubblecast, is also the top scientist on the European Southern Observatory’s European Extremely Large Telescope (E-ELT), now under construction on a Chilean mountaintop. “Dr. J” tells us what this largest ever telescope will help us discover.Learn more about your ad choices. Visit megaphone.fm/adchoices

Jan 13 2015

36mins

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To Mars! With National Geographic

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The National Geographic Channel’s “Mars” miniseries has begun. Mat Kaplan attended a kickoff for the ambitious docudrama last summer. You’ll hear from series technical advisor Bobby Braun, author of “The Martian” Andy Weir, Cosmos creator Ann Druyan and more.Learn more about your ad choices. Visit megaphone.fm/adchoices

Nov 22 2016

46mins

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Visiting the Earth-Like Worlds of TRAPPIST-1

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We have begun to understand the composition of worlds that are hundreds of trillions of kilometers from Earth. Astronomer Nikole Lewis is co-leader of a team that has used the Hubble Space Telescope to do this with the four Earth-like planets circling a star called TRAPPIST-1. Host Mat Kaplan talks with Digital Editor Jason Davis about a new probe designed to discover thousands of additional exoplanets.  Want to win a Planetary Radio t-shirt? Answer this week’s space trivia question posed by Planetary Society Chief Scientist Bruce Betts. Learn more about this week’s topics and see images here: http://www.planetary.org/multimedia/planetary-radio/show/2018/0411-nikole-lewis-trappist-worlds.htmlLearn more about your ad choices. Visit megaphone.fm/adchoices

Apr 11 2018

31mins

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Ann Druyan and the Breakthrough SETI Initiatives

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The Breakthrough Initiatives will pump $100 million into the Search for Extraterrestrial Intelligence in the next 10 years, vastly expanding humanity’s quest to learn if it has company in the universe. Among the leaders of this brave new project is Cosmos creator Ann Druyan. Join us for a special, extended conversation with Ann.Learn more about your ad choices. Visit megaphone.fm/adchoices

Aug 04 2015

30mins

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Getting Humans to Mars

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Three NASA leaders talk with host Mat Kaplan about the progress we're making toward leaving footprints on the Red Planet.Learn more about your ad choices. Visit megaphone.fm/adchoices

May 31 2016

56mins

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Dawn: Ten Years of Exploration

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Dawn Mission Director and Chief Engineer Marc Rayman helps us salute the ion-engine powered spacecraft that first orbited asteroid Vesta in the main asteroid belt and then moved to dwarf planet Ceres, revealing two fascinating worlds.Learn more about your ad choices. Visit megaphone.fm/adchoices

Oct 11 2017

59mins

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Where Do We Come From? The Origin of Life

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Astrobiology is the discipline that explores the origin of life in the universe, and whether life exists anywhere other than Earth. It’s an increasingly exciting field according to University of Washington Research Associate Michael Wong. Mike reviews the current thinking and provides some of the chemical basis for life as we know it, and possibly as we don’t know it. Planetary Society Senior Editor Emily Lakdawalla explains why we don’t see stars in many images of bodies across the solar system, while Society CEO Bill Nye marks the end of the US government shutdown that has hampered so much science. Five more winners will receive copies of First Man in this week’s What’s Up space trivia contest. Learn more at:  http://www.planetary.org/multimedia/planetary-radio/show/2019/0130-2019-michael-wong-life-origin.htmlLearn more about your ad choices. Visit megaphone.fm/adchoices

Jan 30 2019

54mins

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Jim Bell Welcomes “The Interstellar Age”

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Planetary scientist and author Jim Bell has just written “The Interstellar Age—Inside the Forty-Year Voyager Mission.” He talks with Mat Kaplan about the magnificent grand tour of the outer solar system that is now headed toward the stars.Learn more about your ad choices. Visit megaphone.fm/adchoices

Mar 03 2015

46mins

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Space, SETI, the Singularity and Shostak

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Where is everybody? That was the question physicist Enrico Fermi asked when he wondered why we hadn’t yet met ET. What will happen if we do? Will humans lose the will to explore?Learn more about your ad choices. Visit megaphone.fm/adchoices

Feb 07 2018

59mins

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Exploring Saturn With Cassini

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Cassini Mission Project Scientist Linda Spilker returns with the latest discoveries at the beautiful ringed planet, its moons and its rings.Learn more about your ad choices. Visit megaphone.fm/adchoices

Feb 23 2016

32mins

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Zibi Turtle and a Mission to the Ice Giants

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They are the most neglected planets in our solar system, but that status may be changing. Planetary scientist Elizabeth “Zibi” Turtle celebrates NASA’s announcement that it will study a mission to Uranus or Neptune.Learn more about your ad choices. Visit megaphone.fm/adchoices

Sep 22 2015

28mins

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Microbes in Orbit: Cheryl Nickerson’s Revealing Biomedical Research

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You may have heard that the sometimes deadly Salmonella bacterium becomes stronger in microgravity. Cheryl Nickerson tell us about this and other results her team has conducted in low Earth orbit.Learn more about your ad choices. Visit megaphone.fm/adchoices

Apr 08 2014

42mins

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2014: The Year in Space

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Our annual review of the greatest events and accomplishments over the last year features analysis and commentary by Bill Nye the Science Guy, Emily Lakdawalla, Jason Davis, Casey Dreier and Bruce Betts, along with a special new year’s gift of Neil deGrasse Tyson.Learn more about your ad choices. Visit megaphone.fm/adchoices

Dec 30 2014

28mins

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Searching for ET With Pete Worden

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Are we alone? The nearly sixty-year effort to answer that question has gotten a big boost from the Breakthrough Initiatives, funded by Yuri Milner and led by former NASA Ames Research Center director Pete Worden, who is our guest this week.Learn more about your ad choices. Visit megaphone.fm/adchoices

Oct 25 2017

41mins

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Space Policy Edition: The Biggest Policy Moments of the Decade (with Marcia Smith)

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As the 2010s come to a close, Marcia Smith, the founder of Space Policy Online, rejoins the show to explore the most significant and impactful space policy decisions of the 2010s. Mat and Casey also discuss the recently-approved European Space Agency budget, and what it means for planetary defense and Mars sample return efforts. Learn more about this month’s topics through links on the episode page.  https://www.planetary.org/multimedia/planetary-radio/show/2019/space-policy-edition-44.html

Dec 06 2019

1hr 37mins

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A Toast to Alcohol in Space

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They are not for everyone, but there’s no doubt that alcoholic beverages have been part of human culture for as long as there has been human culture. And there’s no reason to think booze won’t follow us across the solar system. Host Mat Kaplan talks with Chris Carberry about his comprehensive and eye-opening book, Alcohol in Space: Past, Present and Future. The December Solstice edition of The Planetary Report has just been published online. Editor-in-chief Emily Lakdawalla provides an enticing overview of its contents. We’ve also got headlines from The Downlink, and a glance at the crowded night sky in What’s Up. Learn more at: https://www.planetary.org/multimedia/planetary-radio/show/2019/1204-2019-chris-carberry-alcohol.html

Dec 04 2019

46mins

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Seeking the Killer Space App with Space Tango

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Organizations are using the microgravity environment of the International Space Station to develop unique new products. One of them is Kentucky-based Space Tango. We’ll meet its chairman and co-founder and the woman who manages its Tangolab. Also, a NASA rep who works with these pioneers. Time magazine has named the Planetary Society’s LightSail its aerospace invention of the year! Society CEO Bill Nye is grateful to all who have been part of the project. Bruce Betts provides a solar sail update at the top of this week’s What’s Up, and wishes Mat a happy 17th anniversary of Planetary Radio. Learn more and go inside Space Tango at: https://www.planetary.org/multimedia/planetary-radio/show/2019/1127-2019-space-tango.html

Nov 27 2019

51mins

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Space Books and Gifts for Space Kids of all Ages

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Our own Emily Lakdawalla, Planetary Society senior editor and book lover, shares her 2019 list of space books for everyone, from infant to adult. She also presents a list of cool space gifts recommended by scientists and engineers. Bruce Betts provides a tantalizing tease for what could be a brief but massive shower of meteors. And there’s much more to look for in the fall sky. You’ll find links to the complete lists of Emily’s recommended space books and gifts at: https://www.planetary.org/multimedia/planetary-radio/show/2019/1120-2019-lakdawalla-books.html

Nov 20 2019

49mins

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A Passionate Conversation with Carolyn Porco

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The outspoken planetary scientist who led the Cassini imaging team finally sits down with Mat Kaplan for a revealing, fun conversation. We also talk with astronomer Jay Pasachoff while he watches tiny Mercury crawl across the face of the Sun. Chief scientist Bruce Betts was in the Planetary Society parking lot enjoying the November 11th transit of Mercury. He joins us from there for What’s Up. Learn more about this week’s guest and topics at: https://www.planetary.org/multimedia/planetary-radio/show/2019/1113-2019-carolyn-porco.html

Nov 13 2019

1hr 27mins

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Our Mysterious Sister: Venus

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Astrophysicist Javier Peralta takes us deep into the thick, fast-moving clouds of the world that is still called Earth's sister by some. Venus is slow to reveal its secrets. Jason Davis helps us celebrate the 50th anniversary of Apollo 12. The Planetary Society wants to hear your space goals, accomplishments and dreams! And Bruce Betts reveals the identity of the first gourmet in space. Space headlines from The Downlink, too. Learn more about this week’s guest and topics at: https://www.planetary.org/multimedia/planetary-radio/show/2019/1106-2019-javier-peralta.html

Nov 06 2019

49mins

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Space Policy Edition: How a Report Can Move Mountains

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How can a simple report—just words on a page—lead to creation of a spacecraft? We explore how a 2019 report on the need for a dedicated, space-based telescope to find threatening near-Earth asteroids motivated NASA to pursue that very mission. We speak with Dr. Jay Melosh, planetary scientist and chair of the National Academies committee behind that report, on how it came together and how the process works behind the scenes. We also check on NASA's budget process in Congress and news from the International Astronautical Congress in Washington, D.C. More resources about this month’s topics are at https://www.planetary.org/multimedia/planetary-radio/show/2019/space-policy-edition-43.html

Nov 01 2019

1hr 30mins

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Finding Wonder and Meaning in a Book by Carl Sagan’s Daughter

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Bill Nye says of Sasha Sagan’s new book, “Sagan finds the meaning of life everywhere—with her family, around the world, and especially among the stars of the cosmos. Read her work; you’ll have a deeper appreciation for your every step, every bite, and every breath.” Mat Kaplan talks with Sasha about For Small Creatures Such as We, and later joins Bruce Betts to offer the book in the new What’s Up space trivia contest. Learn more about this week’s guest and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/1030-2019-sasha-sagan.html

Oct 30 2019

50mins

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How Long Was Mars Wet?

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Planetary scientist Briony Horgan and her team want to know how long liquid water flowed on the surface of the Red Planet before that world froze. Long enough for life to appear and thrive? New work comparing Earth’s extremes may have provided clues. There’s gas in space, and some of it is inside astronauts. Bruce Betts shares the uncomfortable truth in this week’s What’s Up. Also, space headlines from The Downlink. Learn more about this week’s guest and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/1023-2019-briony-horgan.html

Oct 23 2019

28mins

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NASA’s Home for the Bleeding Edge: The 2019 NIAC Symposium

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The NASA Innovative Advanced Concepts program gathers its “fellows” each year to share what they’ve learned about some of the most fascinating science and engineering imaginable. Mat Kaplan visits with Program Executive Jason Derleth and seven leaders of funded studies. Astronaut Mae Jemison also attended and returns to Planetary Radio. Cosmonaut Alexei Leonov passed away last week at 85. He is remembered and praised by space historian John Logsdon. All this, headlines from The Downlink, and Bruce Betts! Learn more about this week’s guests and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/1016-2019-niac-symposium-leonov.html

Oct 16 2019

1hr 17mins

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Space Policy Edition: Happy Fiscal New Year!

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October 1st kicked off federal fiscal year 2020—a day that should also have kicked off a new budget for NASA. But Congress has not funded the space agency yet, instead passing a temporary stopgap measure to keep the government open until November 21st. Brendan Curry, The Planetary Society's Chief of D.C. Operations, joins the show to discuss the latest political developments in Washington, good news for planetary defense, and how the funding delay could spell trouble for the space agency's 2024 lunar goal. More resources about this month’s topics are at http://www.planetary.org/multimedia/planetary-radio/show/2019/space-policy-edition-42.html

Oct 11 2019

56mins

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Nobel Prize Winner Michel Mayor…and More

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Astronomer and astrophysicist Michel Mayor has just been awarded the 2019 Nobel Prize for physics. Listen to Mat’s 2016 conversation with this revered scientist, the first to discover an exoplanet. The Beresheet mission’s Yoav Landsman recently visited Planetary Society HQ and spent a few minutes catching up with Mat. And Society Editorial Director Jason Davis introduces The Downlink, our weekly digest of planetary news. Bruce Betts takes us to a moon of Uranus to find the melancholy Dane. Learn more about this week’s guests and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/1009-2019-michel-mayor-yoav-landsman.html

Oct 09 2019

47mins

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How to Defend Your Planet

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Planetary scientist Vishnu Reddy studies space objects ranging from satellite debris to planet-killing asteroids. He shares the status of our effort to avoid the fate of the dinosaurs in a conversation with host Mat Kaplan. Did you know fruit flies were first in space? That’s just one of the random space facts you’ll absorb in this week’s What’s Up segment with Bruce. Learn more about this week’s guests and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/0925-2019-vishnu-reddy-planetary-defense.html

Oct 02 2019

45mins

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Ad Astra: The Movie!

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Brad Pitt sets out across the solar system to save Earth in the new space epic. Host Mat Kaplan enjoys a far-reaching conversation with the co-screenwriter of Ad Astra that touches on the film’s meaning, the mythic journey of its protagonist, its spectacular images, and where it strays from known science. Registration for the Planetary Society’s 2020 Day of Action in Washington DC is open! Chief Advocate Casey Dreier has the lowdown. You might win a beautiful, rotating MOVA Earth globe in this week’s What’s Up space trivia contest. Hey! That’s LightSail 2 floating above our pale blue dot. Learn more about this week’s guests and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/0925-2019-2019-ethan-gross-ad-astra.html

Sep 25 2019

51mins

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How to Build a Starship: The 2019 Starship Congress

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The biannual Starship Congress attracts starry-eyed believers in humankind’s destiny among the stars. We talk with several of them about their ideas for technologies and science that may help pave the way. Science fiction author David Brin dropped by the Congress and spends a few fun and speculative minutes with us. The September Equinox edition of The Planetary Report is ready for all to read. Editor Emily Lakdawalla gives us a sneak peek. The Milky Way has at least 54 satellite galaxies? Who knew? Bruce Betts, that’s who. Learn more about this week’s guests and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/0918-2019-2019-starship-congress.html

Sep 18 2019

1hr 7mins

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The Unexpected Space Center: Los Alamos National Laboratory

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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. That’s just some of what we’ll learn from Lab historian Alan Carr and longtime Lab astrophysicist Ed Fenimore. The Planetary Society’s Jason Davis has the latest news about India’s lunar lander, while Bruce Betts and Mat Kaplan go where no acronym has gone before. Learn more about this week’s guests and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/0911-2019-carr-fenimore-los-alamos.html

Sep 11 2019

49mins

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Space Policy Edition: Why Apollo Ended (with John Logsdon)

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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. More resources about this month’s topics are at http://www.planetary.org/multimedia/planetary-radio/show/2019/space-policy-edition-41.html

Sep 06 2019

1hr 49mins

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A Comet’s Legacy, and a Helicopter is Ready for Mars

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First we return to JPL for an update on the Mars Helicopter that has just been attached to the belly of the 2020 Mars Rover. Then it’s across the pond for a review of the amazing science coming from the Rosetta mission that spent years exploring comet 67P/Churyumov-Gerasimenko. We wrap things up with another What’s Up view across the solar system and beyond. Learn more about this week’s guests and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/0904-2019-balaram-helicopter-rubin-tubiana-rosetta.html

Sep 04 2019

1hr 1min

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What Will You Send to the Moon?

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Astrobotic is one of several companies that are building small, robotic landers to take commercial payloads to the surface of the Moon. With a new contract from NASA to support his company’s work, CEO John Thornton looks forward to touching down in 2021. Senior editor Emily Lakdawalla can’t wait for the Europa Clipper to reach Europa, one of Jupiter’s ocean moons. Who doesn’t want more cow bell? Chief scientist Bruce Betts gets his share as he helps us explore the current night sky in What’s Up. Learn more about this week’s guests and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/0828-2019-john-thornton-astrobotic.html

Aug 28 2019

44mins

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NASA’s Red Planet Rick and Putting Humans on Mars

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Rick Davis is the perfect person to co-lead NASA’s Mars Human Landing Sites Study. No one is more devoted to putting human bootprints on the Red Planet. He returns to Planetary Radio for this inspiring and informative conversation about our progress. Bruce Betts leads off What’s Up with another brief LightSail 2 update. The Planetary Society’s solar sailing cubesat continues to raise its orbit. Learn more about this week’s guests and topics at: http://www.planetary.org/multimedia/planetary-radio/show/2019/0821-2019-rick-davis-humans-on-mars.html

Aug 21 2019

1hr 4mins

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