In the summer of 1989, a robotic emissary from Earth visited the
farthest major planet from the Sun, Neptune. Like any good tourist, NASA’s
Voyager 2 spacecraft snapped a lot of pictures during the brief flyby. The
prolific probe discovered several moons orbiting close to the blue-green
planet. But one moon, no bigger than a metropolitan city and nearly
coal-black, escaped detection because it was too faint to be seen. Until now.
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