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NASA's Voyager 1 mission after 40 years

NASA's Voyager 1 probe lifted off on Sept. 5, 1977, a few weeks after its twin, Voyager 2. The two probes are yet in space and working. on Aug. 25, 2012, Voyager 1 popped free into interstellar space becoming the first human-made object ever to do so.

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