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When Sputnik was first launched.
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When the Space Shuttle was first used.
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When the Hubble Space Telescope was first used.
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When the Mars Pathfinder Lander was first launched.
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When the ISS was first launched.
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When the Star Dust Probe was first used.
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When the Mars Rover was first launched. (Spirit and Opportunity)
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When the Mars Recon Orbiter was first used.
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