This week's question:

What was the first in space docking of two robotic (unmanned) spacecraft?

To submit your answer:

Complete the contest entry form at http://planetary.org/radiocontest or write to us at [email protected] no later than Wednesday, January 24th at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

As measured by surface area, what is the largest known body of liquid on Saturn’s moon Titan?

Answer:

The answer will be revealed next week.

Question from the week before:

Who chose the names of the Galilean moons of Jupiter?

Answer:

The Galilean moons of Jupiter were named by German astronomer, mathematician and medical doctor Simon Marius, from a suggestion by Johannes Kepler.