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Proteo Proteo es una luna de Neptuno que fue descubierta en 1989 por la nave espacial Voyager 2. Se trata de una de las lunas más grandes y esferoidales de Neptuno. Su superficie está cubierta de cráteres y se cree que se formó hace más de 4 mil millones de años.
Proteo también tiene un mayor contraste de albedo que cualquier otra luna conocida en el sistema solar, lo que puede sugerir que su superficie ha sido removida y re-colocada varias veces en su historia, o que su superficie consiste en dos o más materiales diferentes.