This week's question:

How many NASA field centers are named after former astronauts?

To submit your answer:

Complete the contest entry form at http://planetary.org/radiocontest or write to us at [email protected] no later than Tuesday, June 14th at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

During the current closest approach, how big is the disc of Mars as seen from Earth as measured in arc-seconds?

Answer:

The answer will be revealed next week.

Question from the week before:

As seen from above Jupiter north pole, does the Great Red Spot travel clockwise or counterclockwise?

Answer:

As seen from above Jupiter’s north pole (if that were possible) the Great Red Spot moves counterclockwise.