5.7M views · 95K reactions | 40 years ago this morning, the unthinkable happened: the Space Shuttle Challenger exploded 73 seconds after liftoff, killing all 7 astronauts on board, including Christa McAuliffe, who was supposed to be the first teacher in space. School children watched in horror as the tragedy happened. This is original coverage from the Eyewitness News vault. | ABC7NY | Facebook

70K views · 14K reactions | On the 40th anniversary of the Challenger explosion, 60 Minutes revisits a 1996 interview with engineers who said they tried to stop the launch. The space shuttle broke apart shortly after liftoff, killing all seven crew members, including teacher Christa McAuliffe. | 60 Minutes | Facebook

On January 28th, 1986 the Space Shuttle Challenger exploded and broke apart on take off. This week, Destruction Decoded explores the top 10 most dramatic space accidents, from Baikonur to Cape Canaveral. Watch Destruction Decoded on Wednesdays at 8pm, on National Geographic UK. | National Geographic UK