![]() Neptune is not visible to the unaided eye and is the only planet in the Solar System found by mathematical predictions rather than by empirical observation. ![]() It is named after the Roman god of the sea and has the astronomical symbol, representing Neptune's trident. The planet orbits the Sun once every 164.8 years at an orbital distance of 30.1 astronomical units (4.5 billion kilometres 2.8 billion miles). Being composed primarily of gases and liquids, it has no well-defined solid surface. Neptune is denser and physically smaller than Uranus because its greater mass causes more gravitational compression of its atmosphere. It is 17 times the mass of Earth, and slightly more massive than its near-twin Uranus. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. Neptune is the eighth and farthest planet from the Sun.
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