SOLAR SYSTEM

Detailed explanation-1: -Eris is one of the largest known dwarf planets in our solar system. It’s about the same size as Pluto but is three times farther from the Sun.

Detailed explanation-2: -The Dwarf Planet Known as Eris is More Massive than Pluto, New Data Shows | www.caltech.edu.

Detailed explanation-3: -Eris does not clear out its orbit, so it did not meet one of the requirements. Consequently, it was placed in the newly created category of dwarf planet along with Pluto and Ceres, which also did not meet all of the requirements to be called a planet.

Detailed explanation-4: -Eris is a trans-Neptunian dwarf planet (plutoid). Its orbital characteristics more specifically categorize it as a scattered-disk object (SDO), or a TNO that has been “scattered” from the Kuiper belt into more-distant and unusual orbits following gravitational interactions with Neptune as the Solar System was forming.

Detailed explanation-5: -"The only plausible way for Pluto and Eris to be essentially the same size but for Eris to be 27% more massive is if Eris contains substantially more rock in its interior than Pluto, ‘’ explains Mike Brown (Caltech), who led the team that discovered Eris in 2005.