Uranuksen

Uranus is the seventh planet from the Sun and the third-largest planet in the Solar System by diameter. It is a giant planet, a gas giant, composed mainly of hydrogen and helium, with a significant amount of "ices" such as water, ammonia, and methane. Its atmosphere is the coldest in the Solar System, with temperatures reaching as low as -224 degrees Celsius. Uranus has a distinctive blue-green color due to the presence of methane in its atmosphere, which absorbs red light and reflects blue light.

The planet is unique in that it rotates on its side, with its axis of rotation tilted at an angle of about 98 degrees with respect to its orbital plane. This extreme axial tilt causes Uranus to experience very unusual seasons, with each pole receiving continuous sunlight for 42 Earth years, followed by 42 years of darkness. Uranus has a system of 27 known moons and a set of 13 known rings. The rings are faint and composed primarily of dark, rocky particles.

Uranus was discovered by William Herschel in 1781, making it the first planet discovered with a telescope. It was initially mistaken for a comet or a star. The only spacecraft to have visited Uranus is Voyager 2, which flew past the planet in 1986, providing humanity with its first close-up images and data.