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Sputnik 1 was the first satllite to orbit earth and Spured the U.S. to launch our own satellite
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Put pressure on us to keep up with the USSR because they had two satellites launched and we had one
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Luna 1 was important because it was the first man-made object to orbit around the sun.
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Tiros 1, was impotant because it provided the first accurate forecast based on data garhered from space.
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Yuri Gagarin was important because he was the first person in the world to go to space. The Soviets kept progressing and pushed the U.S. to keep progressing with them.
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Walter Schirra was important not just because he was the second man in space but he orbited the Earth SIX times thats 5 more than the first man in space. It also progressed the U.S.A.
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Cosmonaut Valentia Tereshkova was important because she progressed the USSR even more and became first woman in space.
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Ranger 7 was the first satellites to take images on the moon and allowed the U.S.A. to study the moon by gathering data from Ranger 7
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Alexi Leonov was the first man to preform a space wal and progrees the Soviet Union.
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Neil Armstrong and Buzz Aldrin were the men to preform walking on the moon and was the largest flight which means no ones ever gone to space a group of three. Michael Collins orbited around the moon when Neil Armstron and Buzz Aldrin orbited around the moon