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Planetary RadioDecember 29, 2015

2015: A Great Year for Space Exploration

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On This Episode
Jason Davis thumbnail
Jason Davis

Digital Editor, The Planetary Society

Casey Profile Picture Thumbnail
Casey Dreier

Chief Advocate & Senior Space Policy Adviser, The Planetary Society

Headshot of Emily Lakdawalla (2017, alternate)
Emily Lakdawalla

Senior Editor and Planetary Evangelist, The Planetary Society

Our year-end review features the “best of 2015” lists from Jason Davis, Casey Dreier, Emily Lakdawalla and Bill Nye the Science Guy. What’s Up offers planets, a comet, and a nice prize package for the space trivia contest.

Related Links:

Trivia Contest

This week's prizes are a lovely Planetary Radio t-shirt, a 200-point astronomy account AND a set of Year In Space wall and desk calendars.

This week's question:

What is the orbital period (length of a year) for Sedna, the far distant object in a highly-elliptical orbit?

To submit your answer:

Complete the contest entry form at or write to us at [email protected] no later than Tuesday, January 5th at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

What Apollo spacecraft was name Falcon? Give us the mission number and type of spacecraft.


The answer will be revealed next week.

Question from the week before:

What are the four worlds in our solar system that sand dunes have been discovered on?


The four worlds in our solar system known to have dunes are Venus, Earth, Mars and Titan. Arrakis and Jakku are not in our solar system.

Listen more: Enceladus, Planetary Society Projects, Dawn, Saturn's moons, Jupiter's moons, Europa, Pluto, Orion, Charon, FY2016 NASA Budget, Planetary Radio, LightSail, Mars, Planetary Society, Bill Nye, InSight, Cassini, Curiosity (Mars Science Laboratory), asteroid 1 Ceres, rockets, commercial spaceflight, Rosetta and Philae, Humans in Deep Space, SLS, asteroids, human spaceflight, International Space Station

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