human
Why did the space shuttle explode?
assistant
The Space Shuttle was a reusable spacecraft that was used to launch satellites into orbit. It was designed to be a safe and reliable way to get things into space. However, on January 28, 1986, the Space Shuttle Challenger exploded 73 seconds after takeoff. The cause of the explosion was a failure of the O-ring seals in the solid rocket boosters. This caused the fuel to leak out of the engines, which caused the shuttle to break apart.