Allan McDonald Dies at 83; Tried to Stop the Challenger Launch
An engineer for the company responsible for the shuttle’s booster rockets, he opposed letting it take off, concerned that cold weather might affect them. He was right.
NASA astronaut Ellison Onizuka's soccer ball that survived the Challenger explosion
On Jan. 28,1986, the space shuttle Challenger stunned the nation when it broke apart 73 seconds into flight. This is the story of the soccer ball that survived -- and the family that sent it into space, twice.