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Neptune

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Neptune 101 | National Geographic

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The First Real Images Of Neptune - What Have We Discovered?

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Our Solar System's Planets: Neptune

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What If You Fell Into Neptune?

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The Universe: Travelling Deep Inside Neptune and Uranus Planet 'Documentary HD 2016'

Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune. Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 AU (4.5 billion km). It is named after the Roman god of the sea and has the astronomical symbol ♆, a stylised version of the god Neptune's trident.
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