There have been three other major accidents which have happened to Nasa since it was formed in 1958:

• Date:27 January 1967
  Mission: Apollo 1, part of the attempt to go to the moon.
  What happened: A fire in a capsule in a test on the ground.
  Casualties: Astronauts Roger B Chaffee, Virgil 'Gus' Grissom and Edward H White Jr.

• Date:13 April 1970
  Mission: Apollo 13, part of the attempt to go to the moon.
  What happened: An oxygen tank burst on the way to the moon.
  Casualties: None. All three crew members made it back to Earth.

• Date:28 January 1986
  Mission: Challenger space shuttle on a mission into space
  What happened: A leak made the fuel tanks explode.
  Casualties: All seven crew were lost.