Uranus was discovered in 1781. 
The planet's nuilding materials, temperature and number of moons are very similar to Saturn and Jupiter.  Uranus also has rings, though they're very weak. The rings were discovered in 1977. They consist of ice.

The gravity is almost the same as on earth. The planet is on it's side.
The poles get more heat from the sun then the equator.
Uranus is composed primarily of rock and several ices, with about 15% hydrogen and a little helium. Uranus is in many ways similar to the cores Jupiter and Saturn, except for the massive liquid metallic hydrogen envelope. It seems that Uranus doesn't have a rocky core like Jupiter and Saturn, it's material is more equally divided. 

Like all the other gas planets, Uranus has rings. Like Jupiter's, they are very dark but like Saturn's composed of fairly large particles ranging up to 10 meters in diameter in addition to fine dust. There are 11 known rings, all very faint; the brightest is known as the Epsilon ring. The Uranian rings were the first after Saturn's to be discovered. This was of considerable importance since we now know that rings are a common feature of planets, not a peculiarity of Saturn alone.
The rings of Uranus are 1986U2R, 6, 5, 4, Alpha, Beta, Eta, Gamma, 
Delta, 1986U1R and Epsilon.

Uranus has 15 named moons and 5 recently discover, not yet named satellites. It thus has the most satellites of the solar system. 
The satellites of Uranus are Cordelia, Ophelia, Bianca, Cressida, Desdemona, Juliet, Portia, Rosalind, Belinda, 1986U10, Puck, Miranda, Ariel, Umbriel, Titania, Oberon, Caliban, 1999U1, Sycorax and 1999U2.

The planet has only been visited by one spacecraft, Voyager 2.

The planets diameter is 51,118 km, the orbit is 2,871 million km 
and the planets mass is 8.683e25 km

Pictures of Uranus (Click to see the large picture):

This picture was taken by NASA