Planet Neptune Facts:
Mass: 17.15 Earth-masses
Number of known satellites: 8
Length of Year: 164.8 Earth-years
Mean Distance from the Sun: 4,500 million kilometers
Mean Orbital Velocity: 5.4 kilometers per second
Length of Day: 16.11 hours, 0.67 Earth-day
Equatorial diameter: 49,500 kilometers
Atmospheric components: 74% hydrogen, 25% helium, 1% methane
Moons of Planet Neptune
Neptune has 8 known moons: Triton, Thalassa, Naiad, Despina, Galatea, Larissa, Proteus and Nereid
Triton has the coldest temperatures in the solar system. Voyager observed geysers.
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