Nasa image of the day

The Rolling Planet https://www.youtube.com/watch?v=1hIwD17Crko Uranus The Rolling Planet https://www.youtube.com/watch?v=1hIwD17Crko

discovery The first planet found with the aid of a telescope, Uranus was discovered in 1781 by astronomer William Herschel, although he originally thought it was a comet or star. Named after the Greek god of the sky.

By the numbers Third largest planet 0.047 eccentricity 98 degree tilt Distance from the sun: 19.19 AU Retrograde motion Rotates every 17 Earth hours Orbits the sun every 84 Earth years 27 moons Oberon and Titania are the largest Uranian moons, and were first to be discovered -- by William Herschel in 1787 13 rings

atmosphere Composed of Hydrogen, Helium, Methane Uranus gets its blue-green color from methane gas in the atmosphere Seasons on Uranus last more than 20 years because the planet is tilted on its side. Scientists think it may have collided with a planet-sized object a long time ago. 80 percent or more of the mass of Uranus is consists mostly of icy materials (water, methane, and ammonia). Uranus is very cold, windy and, like most of the other planets, poisonous to humans. It is a gas planet like Jupiter, Saturn and Neptune.

MIssions Voyager 2, the only spacecraft to visit Uranus, imaged a bland-looking sphere in 1986. (Launched in 1977)