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...

Forty years ago, the NASA space shuttle Challenger exploded 73 seconds after liftoff, killing all 7 crew members.

Forty years later, on Sunday, Jan. 25, Seiberling solemnly placed a flower bouquet at the plaque bearing her lost friend's name during Titusville's annual Astronaut Memorial Ceremony at Sand Point Par...