Space probe Osiris-Rex by NASA was launched to collect rock samples from the Bennu asteroid.
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NASA's Spitzer Space Telescope discovered a star with seven Earth-sized planets orbiting it.
Astronomer Nicolaus Copernicus made his first observation of Saturn.
A Neptune-sized exomoon became the first one discovered outside the Solar System.
The US launched the first monkey into space aboard a V2 sounding rocket.
The Apollo-Soyuz Test Project completed the world's first international space rendezvous.
