Uranus is the only giant planet whose equator is nearly at right angles to its orbit. A collision with an Earth-sized object may explain the unique tilt. Nearly a twin in size to Neptune, Uranus has more methane in its mainly hydrogen and helium atmosphere than Jupiter or Saturn. Methane gives Uranus its blue tint.Discovered: March 13, 1781 by William Herschel.

Distance from the Sun: About 1.8 billion miles, about 19 times further than the Earth.

Year: About 84 Earth years.

Day: About 17 Earth hours.

Diameter: About 31,500 miles.

Effective temperature: -357 degrees Fahrenheit.

Atmosphere: Hydrogen, helium, methane.

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