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rocket equation based on Newton's third law of motion was created, “the start of the research” in my opinion.
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U.S Begins creating multistage, liquid fueled rockets.
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US launches the first liquid fueled rocket
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First U.S.-designed rocket to reach edge of space (80 km (49 mi)
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First pictures of earth from 62 mi (100 km)
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First animals in space (fruit flies)
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First artificial satellite and First signals from space
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First animal in orbit, the dog Laika
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Satellite Confirmed the existence of the Van Allen belts
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First firing of a rocket into Earth orbit reaching Earth escape velocity or Trans Lunar Injection and the First detection of solar wind
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First photograph of Earth from orbit
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First spacecraft landing into the moon
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First plants and animals to return alive from Earth orbit
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First human-crewed orbital flight
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Soft landing on the Moon photos from the Moon
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First human on the Moon and first space launch from a celestial body
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First space station
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First photograph of the whole solar system
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Nuclear-powered NASA rover toward Mars to seek out life clues.