Proteus, also known as Neptune VIII, is the second largest Neptunian moon, and Neptune’s largest inner satellite. Discovered by Voyager 2 spacecraft in 1989.
Discovered in 1989 by Voyager 2. Though it is larger than Nereid, it was not discovered earlier because it is very dark and so close to Neptune that it is difficult to see in the glare of the much brighter planet.
Proteus is irregular (non-spherical) in shape. Proteus is probably about as big as an irregular body can be before its gravity pulls it into a more spherical shape.
The heavily cratered surface shows no signs of geologic activity.
16 Aug, 2013
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