To enter, write a haiku that is a message to Mars. Haikus, of course, are three-line poems with a specific syllable count -- five syllables in the first line, seven syllables in the second, and five again in the third. Entries must be submitted by July 1.
NPR's Dave Mattingly wrote one to serve as an example:
Mars, you planet red
No life, just craters and ice
Dark, dark, dark, dark, goose
The public will have two weeks in July to vote on the haikus, and the three favorites will be sent to Mars. The consolation prize for those who don't win the contest is pretty good: Everyone who enters will have his or her name recorded onto a DVD that goes to Mars.