Uranus
Uranus is the seventh planet from the Sun. Its name is a
reference to the Greek god of the sky, Uranus according to
Greek mythology, was the great-grandfather of Ares. It has the
third-largest planetary radius and fourth-largest planetary
mass in the Solar System.
Source:
Wikipedia
The standard model of Uranus's structure is that it consists
of three layers: a rocky (silicate/iron–nickel) core in the
centre, an icy mantle in the middle and an outer gaseous
hydrogen/helium envelope. The core is relatively small, with a
mass of only 0.55 Earth masses.
Source:
Wikipedia
The composition of Uranus's atmosphere is different from its
bulk, consisting mainly of molecular hydrogen and helium. The
helium molar fraction, i.e. the number of helium atoms per
molecule of gas, is 0.15±0.03 in the upper troposphere.
Source:
Wikipedia
