The first US woman in space, Sally Ride, died from pancreatic cancer at the age of 61.
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Europe's Planck spacecraft found evidence that our universe is 13.8 billion years old.
The first spacewalk was made by the Soviet cosmonaut Georgy Grechko during Salyut 6 EO-1 mission.
All nine planets (including Pluto) lined up with the sun.
Cosmonaut Alexey Leonov made the first spacewalk when he left his Voskhod 2 spacecraft.
Danish astronomer Tycho Brahe witnessed the supernova SN 1572.
