FAST FORWARD: An Emergency Call to Tom Kelly: There's Trouble on Apollo 13

On April 13, 1970, nine months after the first lunar landing, another spacecraft on a manned moon mission was speeding through the heavens 205,000 miles from Earth. Suddenly, there was a loud bang. There had been an explosion in a liquid oxygen tank aboard the Apollo 13 spacecraft, endangering the flight and its three astronauts -- James Lovell, Fred Haise and Jack Swigert.

By Michael Dorman