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NEPTUNE

Neptune

Equatorial Radius24,764 km
Mean Density1.64 g/cm³
Sidereal Rotation16h3m
Sidereal Period60,200 days

Sidereal Rotation=One full rotation(1 Earth day) / Sidereal Period=One revolution around the Sun

Neptune is the last of the giant gas planets. It is only visible in a telescope and appears as a small greenish disk. Neptune was discovered not visually, but rather by using Newton's law of gravity.
TritonTriton