Jupiter’s moon was found to have a liquid ocean under a thick crust of ice.
The Galileo probe made the discovery.
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The first US woman in space, Sally Ride, died from pancreatic cancer at the age of 61.
President Richard Nixon passed a new law that allowed NASA to build America's first space shuttle.
The Japanese Space Agency sent two robots to explore an asteroid aboard their Hayabusa-2 spacecraft.
The Hubble Space Telescope captured the first images of the surface of Pluto.
After 14 years in space, NASA's Galileo spacecraft was intentionally destroyed in Jupiter's atmosphere.
