Neptune is the 8th planet from the sun and the 4th largest. Neptune is the god of the sea in Roman mythology. The circumference of its orbit is 4,504,000,000 kilometers. Its diameter is 49,532 kilometers. Its mass is 1.0247e26 kilograms. Neptune has a great black spot that disappears and reappears. It is half the size of Jupiter's spot. Neptune's rings are called Galle, LeVerrier, Lassell, Arago, and Adams.
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