Add Yahoo as a preferred source to see more of our stories on Google. This year marks the 40th anniversary of the Challenger explosion, which occurred 73 seconds after liftoff on Jan. 28, 1986, ...

Forty years after the Challenger disaster, NPR explores the engineers' last-minute efforts to stop the launch, their decades ...

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 ...

The Challenger space shuttle exploded 73 seconds after launch on January 28, 1986, killing all seven crew members. A failed O-ring seal in the right solid rocket booster caused the disaster, which was ...

Main engine exhaust, solid rocket booster plume and an expanding ball of gas from the external tank is visible seconds after the space shuttle Challenger accident on Jan. 28, 1986. "Flight controllers ...

Both the 2003 Columbia and 1986 Challenger space shuttle disasters, which resulted in fatalities, received the "Type A mishap ...

A scathing report by NASA revealed that astronauts Butch Wilmore and Suni Williams, who were once “stranded” in space, came ...

Forty years ago, on January 28, 1986, “exactly 73.621 seconds after liftoff at 11:39 a.m., the space shuttle Challenger exploded, killing all seven persons on board. With the destruction of Challenger ...

On February 1, 2003, the space shuttle Columbia fell apart as it returned to Earth after spending more than two weeks in space. The accident instantly killed all seven astronauts on board. This was ...