The Planet Neptune
A view of Neptune from the Voyager 2 spacecraft.
Some basic facts about Mars
|Orbital Distance from the Sun (kilometers)||4504449769|
|Rotation Period (1=24 hours)||0.67125|
|Mass (Million Metric Tons)||1.024E+14|
|Density (grams/cubic centimeter)||1.64|
Did you know that:
- Neptune takes over 163 Earth years to complete one orbit of the Sun - longer than any other planet.
- Voyager 2 is the only spacecraft to have visited Neptune, which it flew past in August 1989.
- In 1846, both John Adams of England and Urbain Le Verrier of France predicted the existence of a planet beyond Uranus based on mathematical calculations of deviations in Uranus' predicted orbit.
- In 1846, using the mathematical predictions of Urbain Le Verrier, Johann Galle at the Berlin Observatory discovered Neptune.
- Neptune receives less than 1/1000th the amount of sun light as does the Earth.
- Neptune is the smallest of the gas giant planets.
- The orbit of Neptune's moon Triton is slowly decaying and one day it will crash into Neptune
- Triton is the only large moon in the solar system whose orbit is retrograde (backwards).
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