Rockets have always been a major part of getting people into space, but NASA's space shuttles had very specific missions and operated differently.

NASA's Space Shuttle program was a great idea in concept, but flawed execution led to its demise. Here are the problems it was supposed to solve but never did.

The two solid rocket boosters flew in different directions as the external fuel tank became a fireball.(AP: Bruce Weaver / File) Forty years ago, the Challenger space shuttle disintegrated just after lift-off, killing its crew and changing the history of ...