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Dog Laika, aboatd the soviet soacecraft sputnik on 3 November 1957.

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Yuri Gagarin on 12 april 1961.

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Yuri gagarin on 16 june 1963.

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4. First person to walk on the moon. 1969

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4. First person to walk on the moon. 1969

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Neil Armstrong on 16 july 1969 and 24 july 1969.

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5.Voyager 1 and 2 challeger shuttle disaster or Columbia shuttle disaster.

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5.Voyager 1 and 2 challeger shuttle disaster or Columbia shuttle disaster.

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Voyager 1 crossed into interstellar space in August 2012 and continues to collect data. Voyager 2 do study all four of the solar sustem's giant planets at closed range. The Challenger shuttle disaster: A leak in one of the solid rocket boosters.Columbia shuttle disaster: space shuttle columbia disintegrated as il reenterd the atmosphere over Texas and Louisiana, killing all deven astronauts.

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On april 1971,the Soviet Union placed into orbit Salyut the world's first space station.