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Sputnik 1 spurred US to launch it's own satellite.
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Explorer 1 is a landmark in the technical/scientific history of the Space Race.
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April 12th was also the day of 20 years before launch of the first shuttle mission.
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After 48 orbits, and 71 hors, Valentina returned to earth.
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When Alexei stepped on teh Moon, he described it as being "like a seagull with its wings outstretched, soaring high above the Earth.”
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Luna 10 followed the failure of an identical mission.
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Apollo 1 was intended to test important technologies:
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Yuri died a little before his Vostok 1 missions 7th anniversary.
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This shows that other organisms can survive in space for six days.
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When Armstrong climbed down the ladder onto the moon, he said, "That's one small step for a man, one giant leap for mankind."