99.The United States launched its first satellite, Explorer 1, in 1958.

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explorer1
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satellites
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spacerace
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spacetechnology
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nasa
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rocketlaunch
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sputnik
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spaceexploration
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coldwar
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outerspace
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spacecraft
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spaceprogram
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earthorbit
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spacemission
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spacediscovery
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spacescience
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spacehistory
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spaceresearch
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scientificinnovation
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satellite
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engineering
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spacetech
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telescope
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satellite
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spaceflight
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station
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policy