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This week's prize is a Planetary Radio t-shirt.

This week's question:

How many moons has Cassini discovered at Saturn?

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, July 8, at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

What are the Montes or mountains named for on Mercury?

Answer:

The answer will be revealed next week.

Question from the week before:

When did Venus Express enter orbit around Venus?

Answer:

Venus Express orbital insertion took place on April 11, 2006.