The Japanese Space Agency sent two robots to explore an asteroid aboard their Hayabusa-2 spacecraft.
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Astronomer Nicolaus Copernicus made his first observation of Saturn.
The first-ever international crewed space mission was jointly launched by the US and the USSR.
Alvan Graham Clark discovered the white dwarf star Sirius B.
Cassini orbiter released the Huygens probe, which successfully landed on Saturn's moon Titan.
Amateur astronomer Gennady Borisov discovered a strange comet in another star system.
