Hey, you in that comment down there, why should it say 'Enterprise' instead of 'Discovery'? There are more then one Space Shuttle you know! Six were built in all. Enterprise was never used in space (to my knowledge), Columbia disintigrated on reentry, and Challenger was the one that exploded 73 seconds after liftoff. The three that remain Spaceworthy are Discovery, Atlantis, and Endeavor. Discovery was well chosen, as it represents many of the Shuttle Program's advances. Discovery carried the first and third Congressmen to visit space aloft, it launched the Hubble telescope, it was the first Space Shuttle to have a Russian passenger, it was the first shuttle to be launched at night, and it was the first shuttle to be launched on the Fourth of July.