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Nereid

A blurry Nereid as seen by Voyager 2.
A blurry Nereid as seen by Voyager 2. Image: NASA/JPL

Nereid is one of Neptune’s outer moons, and notable for its interminably long orbit. It takes the distant moon about 360 Earth days (nearly an Earth year, if you’re keeping count) to complete a revolution of its host planet.

It’s difficult to observe from the Earth, but observations by Voyager 2 in 1989 indicated Nereid is an icy moon. With new telescopes soon coming online, perhaps we’ll see more of Nereid soon.