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First telescopic observation
First telescopic observation of the night sky: discovery of Jupiter's moons, lunar craters and the phases of Venus. -
First solar probe.
First solar probe. -
First space walk/extra-vehicular activity (Alexei Leonov).
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First human excursion beyond low Earth orbit.
First human excursion beyond low Earth orbit.
First in-person observations of Earth from a distance.
First Trans-Earth injection. -
First photograph of Earth from Earth orbit
First photograph of Earth from Earth orbit. -
First plants grown in space (Arabidopsis).
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First orbital radio observatory.