Eris is made mostly of ice.
hard as a rock because it is made of rock.
It is a dwarf planet. 136199 Eris is just a large trans-Neptunian object like 136108 Haumea, 50000 Quaoar, 134340 Pluto, 136472 Makemake, 225088 (2007 OR10), 90482 Orcus and 90377 Sedna.
Eris is made of rock and ice.
it is mostly made up of rock
There made of Rock and something else
traces of methane,hydrogen and helium atoms like most other planets
it is a planet made mostly of rock or metal
Mercury is a planet made of rock and metal.
Saturn is the planet with rings made of ice and rock.
Not really. Eris is a real object that orbits the sun, but it is not considered a planet.
The answer is Pluto. Pluto isn't a planet anymore so there is no planet made up of rock and ice.
Some features are:It is not known as a planet but as a dwarf planet.It is the largest dwarf planet out of all of the dwarf planets.It has a temperature of around - 207 degrees C.It is 10 billion miles from the sun.It takes 560 days to orbit the sun.