In Greek mythology, Uranus was the father of the Titans. In 1781, Uranus became the first planet discovered with the aid of a telescope. At least 11 rings and 20 moons encircle it, its surface temperature remains consistently minus 385 degrees F in both summer and winter, and it is the only planet in the Solar System tipped on its side. Uranus lies 1.78 billion miles from the Sun, sunlight arrives in 2.7 hours, its year lasts 84 Earth years, its day lasts 17.9 Earth hours, and it is 1.24 miles to Neptune and 1.10 miles to Saturn.