Join Donate

Planetary RadioApril 5, 2017

Mars’ Atmosphere…Lost in Space!

Download MP3

On This Episode
Bruce Jakosky Head Shot
Bruce Jakosky

MAVEN Principal Investigator, University of Colorado Boulder

Mars was once a warm and wet world. Then its dense, protective atmosphere mostly vanished. Learning why was one of the greatest mysteries in planetary science. The answer has just been delivered by the MAVEN orbiter. Principal Investigator Bruce Jakosky will take us through it. Bill Nye the Science Guy co-chairs the March for Science. We’ll talk to him about this new effort and the successful relaunch of a SpaceX booster. Last chance to win a rubber asteroid is in this week’s What’s Up space trivia contest!

MAVEN arrives at Mars


MAVEN arrives at Mars

Related Links:

Trivia Contest

This week's prizes are a Planetary Radio t-shirt, now available in both men’s and women’s styles, a 200-point astronomy account, and a Planetary Society rubber asteroid.

This week's question:

Who first noted what turned out to be Neptune, even though he is not credited with the discovery because he didn’t report its movement and may have thought it was a star?

To submit your answer:

Complete the contest entry form at or write to us at no later than Wednesday, April 12th at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

What is the optically brightest quasar as seen from Earth?


The answer will be revealed next week.

Question from the week before:

What is the only Apollo Command Module flown in space that is currently on display outside the United States?


Charlie Brown, the Apollo 10 Command Module, is in the London Science Museum (with the LightSail engineering model).

Listen more: Commercial spaceflight, Space Policy, events and announcements, Planetary Radio, MAVEN, Mars, Bill Nye

You are here:
Comments & Sharing
Bill Nye and people
Let's Change the World

Become a member of The Planetary Society and together we will create the future of space exploration.

Join Today

Mat Kaplan
Support Planetary Radio

Keep our weekly radio program broadcasting online and on the air around the world.