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Uranus Basic Facts About Uranus Miles from Sun: 1,800,000,000 miles Orbital Period: 84 years Rotational Period: 17.25 hours Surface Temperature: -357 degrees F Gravity: 100 pounds on earth would be 86 pounds It has 27 moons Weird Rotation Uranus is tilted almost parallel to its orbital plane so it appears that it is on its side This may have happened by a collision with a planet sized body early in the planets history It is blue because of high levels of methane How it was Discovered It was the first planet discovered by the aid of a telescope It was discovered in 1781 How it Got its Name It was discovered by William Herschel in 1781 He tried to name it Georgian Sidus after the TYRANT King George 111 Uranus is the Roman god of the sky Neptune Basic Facts About Neptune Miles from Sun: 2,800,000,000 miles Orbital Period: 165 years Rotational Period: 16 hours Surface Temperature: -353 degrees F (Coldest planet) Gravity: 100 pounds on Earth would be 110 pounds How it was Discovered It was discovered by mathematics They looked at orbit of Uranus and found that it didn't follow the exact path it should It was finally discovered in 1846 Interesting Facts It is the windiest planet in the Solar System (800-900 mph) It is blue because of methane in atmosphere It takes about 12 years for a satellite to reach Neptune Pluto Basic Facts About Pluto Distance from Sun:3,670,000,000 Orbital Period: 247.92 years Surface Temperature: -387 degrees F Gravity: 100 pounds on Earth would be 8 pounds