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. At first, Eris appeared to be larger than Pluto.

Detailed explanation-2: -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-3: -Reference Article: Facts about Eris, the first dwarf planet discovered. Eris was one of the first dwarf planets to be discovered in the solar system. It is almost the same size as Pluto, and its discovery directly led to the former ninth planet’s demotion.

Detailed explanation-4: -As the second-largest known dwarf planet, Pluto is approximately 2, 390 km in diameter and is composed primarily of ice and rock. It is very difficult to precisely determine the diameter of Pluto since it is so far away. Pluto is, on average, 40 times farther from the Sun than Earth.