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                                            Planet Neptune Facts

Neptune is the most distant planet from the Sun as it sits on the eighth position. It is the smallest of all the gas giants with an equatorial radius of 24,764 km. Neptune’s surface gravity is only 17% stronger than the earth. It is the coldest planet and has the strongest winds in the entire solar system. Temperature on Neptune can dip down to -221.45°C. This planet has a ring system as well although it is difficult to observe. There are total five rings of Neptune. This planet is named after the Roman god of the sea.

Quick Facts: –

  • NASA’s Voyager 2 is the only spacecraft that has ever visited the planet Neptune on August 25.
  • Neptune is the fourth largest planet in the entire solar system.
  • There is methane present in the atmosphere of Neptune that absorbs the red light. This is the reason why it appears blue.
  • Diameter of the planet is 49,493 kilometres.
  • Neptune has total 13 moons: – Psamathe, Sao, Neso, Halimede, Laomedeia, Nereid, Galatea, Larissa, Proteus, Despina, Naiad, Thalassa and Triton.
  • Triton is the largest of all of them and the only large moon with retrograde orbit.
  • The surface temperature of Triton can reach as low as -240°C.
  • This planet can never be seen by naked human eye.
  • The atmosphere of Neptune is composed of 80% hydrogen, 19% helium and the remaining 1% is a mixture of other gases.
  • One year on Neptune lasts for approximately 165 earth years.
  • Similar to other gas giants, Neptune has no solid surface.
  • This planet has an unknown internal source of heat as it radiates 2.6 times more energy than it receives from the Sun.


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Declan, Tobin. " Fun Facts for Kids about Planet Neptune ." Easy Science for Kids, Jul 2020. Web. 13 Jul 2020. < >.

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