Planetary Radio • Sep 27, 2016

Rocket Road Trip!

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On This Episode

Planetary Society Digital Editor Jason Davis returns with the story of the ten-day trek across the South he just completed with two Society colleagues. Emily Lakdawalla has the announcement of new evidence for water plumes on Jupiter’s moon Europa. Bill Nye reports from the International Astronautical Congress in Guadalajara, Mexico. Those cosmic cut-ups, Bruce Betts and Mat Kaplan, have a new What’s Up space trivia contest and much more.

Jason Davis on the #RocketRoadTrip
Jason Davis on the #RocketRoadTrip Digital Editor Jason Davis at business end of SLS RS-25 rocket engine in Stennis Space Center, Mississippi.Image: Casey Dreier

This week's question:

What is the surface gravity on Jupiter’s moon Europa in Gs?

To submit your answer:

Complete the contest entry form at or write to us at [email protected] no later than Tuesday, October 4th at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

Where are the three Deep Space Network facilities?


The answer will be revealed next week.

Question from the week before:

For spacecraft not headed to or near the Moon, what human mission had the highest apogee (traveled the farthest from Earth)?


At 1,369 kilometers or 850 miles, Gemini 11 in 1966 had the highest apoapsis of any human spacecraft that didn’t go to the moon.