Eris is the the biggest of the dwarf planets and is the ninth biggest object that orbits the Sun. Eris was initially called the tenth planet and then was formally downgraded to a dwarf planet along with Pluto and Ceres. Eris is named after the Greek goddess of strife and discord but was originally named 2003 UB313 and unofficially Xena after the the TV show Xena: Warrior Princess

Surface of Eris
The surface of Eris is thought to be made up of methane ice which may sublimate when the planet is closer to the sun and re-condense when it goes further out.

Time on Eris
A year on Eris is 557 Earth years and scientists think that a day might be 26 hours but they may be off by up to 8 hours.    

Eris' Moons
Eris has at least one moon, it is named Dysnomia.


Exploration and Observation
Eris was discovered in 2005 from photographs taken in 2003. Eris is so new, it is so far away and dim that there has not been much study of the plant. Scientists have analyzed the reflected light from Eris to determine its surface makeup.

Size of Eris
Eris is three-thousandths the size of Earth and has 9% of the gravitational pull that Earth has.

Eris' Composition
We have very little data about what Eris may be made of If it is like Pluto it would have a solid core surrounded with different ices but more research will need to be done to know for sure.

Eris in the Night Sky
Eris can only be seen with extremely powerful telescopes and then it is still just a point of light. So unless you can get some time on a very large telescope you will probably just have to look at pictures.

Big Brain Science | Topics | Solar System | Eris
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