From satellites to the moon, NASA has conducted dozens of successful missions to space. These are some of the most famous. We'll start with a look at NASA's first space station.
In its nearly 30-year history, the space shuttle program has seen exhilarating highs and devastating lows. Learn all about the space shuttle program.
SETI is the Search for Extraterrestrial Intelligence, and it's dedicated to discovering signals sent to Earth from far, far away. Find out what would happen if an extraterrestrial were to make contact.