Artist's concept of NASA's Voyager spacecraft.After the Voyager 1 and its replica Voyager 2 launched in 1977, their power sources are slowly dying.NASA/JPL-Caltech NASA's Voyager 2 spacecraft, which has been probing the outer bounds of the solar system for over 45 years, is running out of power.But a new plan aims to keep its interstellar mission alive for at least three more years.
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