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  • Neptune 101 | National Geographic

    YouTube 02:58
  • The First Real Images Of Neptune - What Have We Discovered?

    YouTube 11:13
  • Our Solar System's Planets: Neptune

    YouTube 13:33
  • The Universe: Travelling Deep Inside Neptune and Uranus Planet 'Documentary HD 2016'

    YouTube 43:07
  • What If You Fell Into Neptune?

    YouTube 06:57
  • The Sun | Educational Video for Kids.

    YouTube 03:36
  • 16 Facts about Poseidon - The God of the Sea - Mythological Curiosities #03 See U in History

    YouTube 02:59
  • PBS NewsHour West live episode, Sept. 22, 2021

    YouTube 00:00
  • Jupiter 101 | National Geographic

    YouTube 03:17
  • New Horizons Flyover of Pluto

    YouTube 02:00
  • Saturn 101 | National Geographic

    YouTube 04:07

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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