NEPTUNE'S CLOSEST MOON Crossword Clue
NEPTUNE'S CLOSEST MOON Crossword Clue
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Crossword Puzzle Infos
Naiad is the closest moon to Neptune, with a mean orbital radius of only 50, 000 km. It was discovered in 1989 by the Voyager 2 spacecraft and is the innermost of Neptune's moons. NAIAD is the smallest of Neptune's moons, measuring only about 40 km in diameter. It is also the least massive, with a mass of only 1.2 x 10^18 kg.