Uranus was the first planet which is discovered with the
help of a telescope(the other planets can be seen with
the naked eye). Only 200 years after its discovery in
1977, scientists discovered a system of rings around it
when a star was moving behind Uranus and the starlight
dimmed and brightened several times before disappearing.
The only possible explanation was a system of rings.
This idea was confirmed when Voyager 2 passed it.
STRUCTURE OF URANUS
Uranus' mantle is made up of water, rocks, methane and ammonia. Most of the mantle will be a hot liquid but near and on the surface is a frozen layer. There is a rocky core as most of the planets but there is no crust. The planet's mass is mostly in the mantle. Uranus has an atmosphere of hydrogen , helium and small amounts of other chemicals.
AXIS OF URANUS
Uranus's axis is tilted right over to the right, so it appears to roll on its side round the sun. Because of its unique axis, some parts of the planets experience a day over a period of 42 earth years.