NeptuneImage courtesy Nasa Diameter: 49538 kilometers Mass: 17.14 of Earth Orbit around sun: 60190 days Surface Temperature: -201 degrees Centigrade Moons: 11 The wind on Neptune is the strongest that is seen in our Solar System. Recorded speeds over 700mph are recorded regularly, and they are responsible for Neptunes own dark spot a little like the spot on Jupiter. Neptune is the least visited planet by space probes sent from Earth and has currently only had a flyby from Voyager 2 in 1989. Neptune is known to have at least 11 moons, the largest of which is Triton.
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