Do you have any idea how much of the space shuttle Challenger is still lost in the ocean? The disaster of this infamous mission was an unthinkable tragedy, but behind the headlines, there's a deeper ...

it is with deep, heartfelt sorrow. I address you here this afternoon at 11:40 a.m. This morning Space program experienced a national tragedy with the explosion of the space shuttle Challenger.

WASHINGTON — It's been 39 years since the Challenger space shuttle explosion, one of NASA's most devastating tragedies. NASA's Challenger shuttle exploded 73 seconds after lifting off on Jan. 28, 1986 ...