Forty years ago, the U.S. space shuttle Challenger set out on a mission to not just launch satellites but to carry the first teacher into space and to inspire the promise of spaceflight into classroom...

It's now been 40 years since New Hampshire school teacher Christa McAuliffe died when the space shuttle Challenger exploded.

Just 73 seconds after liftoff, the shuttle broke apart in midair, killing all seven crew members.