On January 28, 1986, the space shuttle Challenger exploded shortly after lift off, killing the seven crew members on board.

For millions, it was an event that would be seared into their memories for the rest of their lives – on par with the Kennedy ...

Sierra Space officials announced the autonomous spacecraft successfully completed and passed testing milestones in ...

It's been 39 years since the Challenger space shuttle, carrying seven people, took off from Florida's Kennedy Space Center, ...