The shuttle launches were a beacon to many worldwide for optimism in science, so Challenger's loss was both national disaster ... first space tragedy - all three crew members on board Apollo ...

NASA marked the 20th anniversary of the space ... loss of shuttle Challenger during liftoff on Jan. 28, 1986, killing all seven aboard, including schoolteacher Christa McAuliffe. The Apollo ...

which opened 15 years ago as the official national memorial for the Columbia space shuttle crew who died in the 2003 disaster. People are invited to celebrate its journey across Bellflower ...