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Astronaut Scott Kelly and Cosmonaut Mikhail Kornienko return to Earth after their 340-day space mission, longest recorded time in space for ISS crew members.
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First man-made probe to make a planned and soft landing on a comet
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First sample of solar wind returned beyond lunar orbit
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First multinational space station,
Largest man-made object built in space to date -
the very first Venus soil samples and sound recording of a whole other world
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the very first mission to enter the asteroid belt and leave inner Solar System
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This was the very first woman to go to space, Valentina Tereshkova, she currently 79.
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this is when the First photograph of Earth was taken from orbit
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First exposition of the rocket equation based on Newton's third law of motion: Treatise on the Motion of Rockets
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Theses were the discovery's of Jupiter's moons, lunar craters and the phases of Venus excised.