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It is the first space research flight (cosmic radiations experiment)
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U.S.S.R lanches the first man-made object to orbit the Earth,
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It had the first rocket in Earth's orbit, first reaching Earth escape volicity, and had the first solar wind detection.
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Earth's Orbit had its very own first picture taken.
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The far side of moon or dark side of moon were first taken photos of it.
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The weather satellite was the first success to get into space
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The first satellite beam was first lived in transatlantic telecast.
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The photo graph of the moon were relayed first close-range.
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Neil Armstrong and Edwin Aldrin peformed the first moonwalk
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This was the day and year where Mars had a first impact.
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It was the first Venus soil samples and sound recording of another world.
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Polar was the first to orbit around the sun.
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First orbit of Jupiter.
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First orbiting of an asteroid.
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First landing on an asteroid.