In 1972, Apollo 16 astronaut Charles Duke left the above photo of his family on the moon. Don't let it be the only thing aliens know us by. (Seriously, look at that kid's tie.) Thanks to Lunar Legacy ($10), you can have any image or message travel to the moon and remain there forever. But don't worry — they're not going to open the shuttle door and dump thousands of pictures everywhere. The photo of you and your "guns" will be a digital image included on one of several DVDs inside a time capsule left behind.