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In 1977, NASA launched two probes designed to last five years. Voyager 1 and 2 are now the only human-made objects in interstellar space, still operating, still transmitting, funded by a team of engineers some of whom have worked on the mission for nearly

Launched in 1977 for a five-year mission, NASA's Voyager probes continue to transmit data from the depths of interstellar space.