NASA to Smack a Comet
Link - NASA is on a collision course with a comet, and scientists say they can't wait to see what happens. The collision, which is to take place between a projectile fired from the space agency's Deep Impact spacecraft and a 4-mile-wide comet known as Tempel 1, is scheduled for July 4, 2005. That's when Tempel 1 will be close enough to Earth for astronomers to monitor the debris that the impact kicks up. If the mission is successful, it will help the scientists see for the first time just what comets are made of.