Add Yahoo as a preferred source to see more of our stories on Google. The 40th anniversary of the Space Shuttle Challenger disaster comes as NASA prepares for its next major step in human spaceflight.

Add Yahoo as a preferred source to see more of our stories on Google. The space shuttle Challenger lifted off on January 28, 1986. An explosion 73 seconds after liftoff claimed the lives of the crew. ...

Forty years ago on Wednesday, the world witnessed one of the worst space tragedies. The Challenger mission exploded, and weather was partly to blame. The same cold weather is happening as NASA preps ...

Forty years ago this week, after spending five days at Cape Canaveral and enduring three aborted launch attempts of the Space Shuttle Challenger while waiting to see fellow Teacher in Space candidate ...

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 ...

Earlier this month, NASA successfully evacuated four crew members from the International Space Station following a medical emergency. The four astronauts — two from the United States, one from Japan ...

(CNN) — NASA’s Space Shuttle Challenger lifted off 40 years ago with an unusual crew. In addition to six astronauts, the mission took flight with a teacher on board. Christa McAuliffe, the first ...