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For 23 days in the fall of 1957,
Sputnik 1
, orbited the earth collecting and transmitting information about the outer edge of our planet's atmosphere. Sputnik was the first of many unmanned "robotic" explorers launched into space.
Opportunity
Spirit
Beagle 2
Chandra X-Ray Observatory
Compton Gamma-Ray Observatory
Hubble Space Telescope
Mars Exploration Rover
Pioneer 10
Pioneer 11
Stardust
Viking 1
Viking 2
Voyager 1
Voyager 2
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