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space age begins soviet union launched sputnick 1
soviet union launched sputnick 1 -
soviet union space probe hit the moon
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yuri gagarin was the first pilot in space
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united states space probe flew by venus
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united states launched apollo 8
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neil armstrong landed on the moon
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apollo lunar model was cancelled
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united states launched a german space probe
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united states launched another german space probe
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two other us probes land on mars