Families of the astronauts lost in the space shuttle Challenger accident are marking that tragic day 40 years ago ...

Today, we're taking a close look at 10 of the worst space exploration accidents. Instead of focusing solely on the loss of life to determine what is worst, we'd like to take a two-pronged approach ...

Executives in the fledgling commercial U.S. space industry are bracing for increased scrutiny and oversight after two accidents last week, including one that killed a pilot, but say they view the ...