NORMALLY, BODIES OVER ABOUT 200 km/ 125 mi in radius will have sufficient mass to form a sphere, but despite Proteus measuring around 210 km/ 130 mi in radius, it has a very irregular surface, featuring concave depressions and ridges up to 20 km/ 12.4 mi high.
The surface is dark and heavily cratered with the largest moon than 250 km/ 155 mi in diameter with a depth of 20 km/ 12.4 mi.
It is likely that Proteus formed from debris cratered by collisions between Neptune's smaller moons, the result of disrupted orbits caused by the capture of Triton
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| Proteus |
It is likely that Proteus formed from debris cratered by collisions between Neptune's smaller moons, the result of disrupted orbits caused by the capture of Triton
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