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Uranus Facts

William Herschel discovered Uranus in 1781.


Uranus has 27 known moons.

Voyager 2 is the only spacecraft to fly by Uranus.

Uranus' atmosphere, like that of other gas giants, is primarily made up of hydrogen and helium.

Uranus was the first planet discovered by observing with a telescope.

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Like other gas giants, Uranus has a ring system too.

No spacecraft has ever orbited the planet.

Uranus rotates on its side due to a massive 98-degree tilt in its axis.

Uranus has a short day and a long year. One Uranian day is just 17 Earth hours long and one uranian year is 84 Earth years long.

Uranus is a colossal planet. To put it in perspective, if Earth were an apple, Uranus would be a basketball.

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