Uranus

Uranus was discovered in 1781 by William Herschel and is the seventh planet from the Sun.It went through different names before Uranus became most commonly used around 1850. He discovered it with a telescope, however it is just at the edge of what is visible to the naked eye. He originally thought it was a comet, but found that it has a low-eccentricity elliptical orbit around the sun. The equatorial plane is inclined 98° to its orbital plane and has a retrograde rotation, which means that it rotates from east to west, rather than from west to east.

Uranus is very cold because it is so far away from the sun. This also results in ammonia freezing out of the atmosphere. The atmosphere is made of methane and hydrogen and possibly helium. Uranus is blue green when seen through a telescope because red light is absorbed into the atmosphere while green light is reflected back out into space.

Uranus probably has a rock and liquid core that is surround by water and dissolved ammonia. The clouds of Uranus' atmosphere are banded and have differential rotation. Uranus is also surrounded by a magnetosphere. Uranus has rings like Saturn. The rings of Uranus were the next planetary rings to be discovered after Saturn's. This showed that rings are a common feature, not something unique to Saturn.

Uranus has the most known moons of any planet, with 15 named moons and an additional 5 unnamed moons. Voyager 2 discovered 10 of the moons, the five largest had been known prior to Voyager 2's flyby and the remaining five are recently discovered. The names of the 15 named moons are Cordelia, Ophelia, Bianca, Cressida, Desdemona, Juliet, Portia, Rosalind, Belinda, Puck, Miranda, Ariel, Umbriel, Titania, and Oberon.