Voyager 2 outbound

Neptune and TritonNASA’s unmanned Voyager 2 space probe leaves the vicinity of the planet Neptune, the outermost planet to have been explored by a man-made spacecraft. (At this point in time, Pluto is still considered a planet – the only one to which NASA hasn’t sent a space probe – though by the time a vehicle is dispatched to Pluto in the 21st century, Pluto has been demoted to “minor planet” status.) Though not expected to function beyond 2025 due to the slow decay of its nuclear power source, Voyager 2 may survive long enough to pass within 25,000,000,000,000 miles of Sirius in a quarter of a million years.

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