Eris, or 136199 Eris in full, is well known as the biggest dwarf planet in the universe and it is the ninth largest planet that directly orbits the Sun. It has a diameter of around 2500 kilometers and it is about 27% bigger compared to the Pluto. It is categorized as a dwarf planets as well as trans-Neptunion object (TNO). It is then known as plutoid due to the intersection of both categorizations.

The Palomar Observatory based team headed by Mike brown, are the pioneer of largest dwarf planet discovery back in the first month in the year of 2005. However, the identity of this planet was then identified later on the year itself. The largest dwarf planet consists of a moon, named Dysnomia. Unfortunately, there is no further evidence on satellites in current research. In current research as well, the distance obtained of this dwarf planet from Sun is approximately three times further than the former furthest planet, Pluto or in numerically 96.7 astronomical units.

Due to the face that this planet is bigger in size compared to Pluto, the pioneer and NASA defined this planet as the tenth planet in the Solar system. In parallel with the prospect of other similar size objects that will be discovered in future, the International Astronomical Union (IAU) is highly motivated to define these discoveries as planet. IAU was the one who defined that Eris is a ‘dwarf planet’ which falls into the same category with Pluto, Makemake, Ceres and also Haumea.

The orbit of this planet has a full orbital period of 557 years, comparing to Earth’s which only takes a year. The planet itself and the moon are now known as the furthest objects in the Solar system separated by long-term comets and also space probes. But, around 40 TNOs has better average orbital than this dwarf planet, with a total of 67.7 astronomical units.

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