Planet Neptune

The planet Neptune was discovered by Johann Galle and Urbain Le Verrier on September 23, 1846.

Neptune is the 8th and the last planet of the Solar System. Neptune is the smallest gas planet.

Discovery Of Planet Neptune:

The Neptune was the first planet to be discovered through mathematical calculations!

In 1821, Alex Bouvard, a French astronomer predicted that the gravitation pull of an unknown celestial body was responsible for the orbital irregularities of planet Neptune.

In 1846, Urbain Joseph Le Verrier, a French mathematician calculated the location of the planet Uranus. He sent his prediction to Johann Gottfried Galle.

In 1846, Johann Gottfried Galle found the planet using telescope at the Berlin Observatory.

Facts About Planet Neptune:

  • Neptune is the last planet of the Solar System.
    It is the 8th planet from the Sun. The planet Neptune is nearly 4.5 billion kilometers (2.8 billion miles) from the Sun.
  • Neptune is the smallest ice giant planet.
    There are two ice giant planets. They are: Uranus & Neptune. Neptune is the smallest ice giant planet.
  • Neptune is the coldest planet in the Solar System.
    The average surface temperature of planet Neptune is 214°C (-353°F).
  • Neptune is blue in color.
    The atmosphere of Neptune contains methane. It absorbs red light, thus causing a beautiful blue hue to the planet Neptune.
  • Neptune rotates quickly.
    The planet Neptune doesn’t have a solid body so it spins quickly. It takes 16.03 hrs. to complete one rotation.
  • Neptune has windy atmosphere.
    The wind speed can reach up to 2,100 km/hour (1,200 miles/hour).
  • Neptune has 5 main planetary rings.
    The rings are not uniform and it is faint. The names of the rings are: Adams, Arago, Galle, Lassell and Le Verrier.
  • Neptune has 14 moons.
    Triton is the largest moon of the planet Neptune. The other moons are: Despina, Galatea, Halimede, Laomedeia, Larissa, Naiad, Nereid, Neso, Proteus, Psamathe, S/2004N1, Sao and Thalassa.

Planet Neptune Statistics:

Mass102×1024 kg
Diameter49,528 km
Density1,638 kg/m3
Gravity11 m/s2
Tilt of Axis29.6º
Mean Temperature-200ºC
Distance from Sun4495.1×106 km
Rotation Period16.03 hrs.
Revolution Period164.79 Earth years

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