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It was the first artifisuale statellite lanched into space by Soviet Union. The United States worried the Soviets could have a nuclier missle that could reach the United States.
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It was the first dog/ living thing in space. The dog proved that living things could servive on a spacecraft in space.
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NASA (National Aeronautics and Space Administration) is a huge government agency of space travel in the Unired States. That is how everything the U.S gets sent into space is by NASA.
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He was the first human into space. He proved that human could survive in space on a space craft and was the first human to orbit the Earth.
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He gave a very important speech on the start of space exploration and scientific research. This was also the start of the appolo program.
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First american to orbit Earth. Secound human to go into space and orbit the Earth.
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They where the first ever up close photos of the moon anybody had on Earth.
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Ed White performs the first american space walk. He was the first american/ human being to walk in space.
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The first spacecraft to land on the moon. And the first soviet thing to land on the moon.
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The first Appolo mission crew to land on the moon and return home safely.
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The secound artifisual satellite to go into space. It was important because it ment that the U.S was in the space race and one of the first artifisual satellites launched into space.
http://www.thespacerace.com/timeline/