Although Proteus is larger than Nereid, it was not discovered earlier because it is very dark (among the darkest objects in the solar system) and so close to Neptune that it is difficult to see in the glare of the much brighter planet. Proteus is thought to be about as large as a satellite can without being drawn into a spherical shape by its own gravity.
Related entry Neptune, moons
Related category PLANETS AND MOONS
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