A cosmic explosion with an energy level equivalent to the output of a billion of suns went unnoticed by astronomers — until they caught the "echo" of this so-called gamma-ray burst, that is.

Seven astronauts were killed in the 1986 space shuttle Challenger disaster. Because a teacher was aboard, millions of schoolchildren watched the event live in school. Forty years later, many of those ...

SpaceX's multi-trillion dollar IPO could come flying apart if its Starship rocket does on its upcoming test flight.

Forty years ago today, Americans were stunned, shocked and saddened when the Challenger space shuttle exploded 73 seconds after liftoff on a cold, cloudless day in Florida. A booster leak ignited the ...