The Japanese Space Agency sent two robots to explore an asteroid aboard their Hayabusa-2 spacecraft.
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The 51 Pegasi b planet was discovered. It was the first discovered exoplanet around a sun-like star.
A powerful meteor exploded over the Bering Sea.
Charles Messier discovered the Whirlpool Galaxy.
The first spacewalk was made by the Soviet cosmonaut Georgy Grechko during Salyut 6 EO-1 mission.
The New York Times published Edwin Hubble's discovery that the Andromeda 'nebula' is actually a galaxy.
