Adjective(s) Uranian
Orbital properties
Aphelion/apoapsis 3 004 419 704 km (about 20,083 AU)
Perihelion/periapsis 2 748 938 461 km (about 18,375 AU)
Semi-major axis 2 876 679 082 km (about 19,229 AU)
Orbital eccentricity 0.0444
Orbital period 30 799 days (84,323 years)
Average orbital speed 6,81 km/s
Physical properties
Radius 25 559 km (equatorial); 24 973 km (polar; slightly oblate)
Mass 8.6810 x 10^26 kg; 14,536 Earth masses
Mean density 1,27 g/cm³
Escape velocity 21,3 km/s
Rotation period 0,718 days (17 hours, 14 minutes and 24 seconds)
Average surface temperature 49 degrees Kelvin (minimum) ( -228,15 °C)
Apparent magnitude 5,9 (minimum), 5,32 (maximum)
Moons 27

Uranus was the seventh farthest planet to the Sun. It is one of the planets that cannot be seen by the naked eye.

History and DeathEdit

When Uranus was first seen by astronomers, they thought it was a star. Later they observed it moving across the sky, and then, on March 13, 1781, Uranus was officially called a planet. Uranus was discovered by William Herschel. Now Planet Uranus is dead. It exploded.


  • Uranus is tilted on its side for reasons unknown. Some scientists think asteroids kept hitting it until it fell onto its side.
  • A possible explanation is that an earth sized body hit it and it tipped over
  • Because Uranus is tilted on it's axis, the poles experience 42 years of sunlight, and then 42 years of darkness.
  • Uranus's moons and rings orbit up and down because of Uranus's spin.
  • It is tilted at an angle of 99º. Earth is tilted only 23.5º, and Jupiter is even less at 3.77º.


  • Uranus is usually 3 billion km away from the Sun.
  • Uranus has a very thin dusty ring. This ring is not visible to the naked eye.
  • Uranus makes one orbit around the Sun once every 84 Earth years.
  • Uranus is the third largest planet in our Solar System.
  • Methane in the planet's atmosphere gives it the pale blue color.
  • Voyager 2 was the only spacecraft to reach Uranus.
  • A day on Uranus lasts 17 hours.
  • Uranus's year lasts 84 Earth years.
  • Uranus' moons are named after characters in William Shakespears plays.
Uranian Moons
Cordelia - Ophelia - Bianca - Cressida - Desdemona - Juliet - Portia - Rosalind - Cupid - Belinda - Perdita - Puck - Mab - Miranda - Ariel - Umbriel - Titania - Oberon Francisco - Caliban - Stephano - Trinculo - Sycorax - Margaret - Prospero - Setebos - Ferdinand
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