Eris is the most distant dwarf planet from the Sun and has the greatest mass. Eris is the second largest dwarf planet (very a close second to Pluto) and at one point was considered for the position of the 10th planet. Eris’ discovery promoted discussion that eventually lead to the classification of ‘Dwarf Planets’.

Eris Size

Eris size compared to the Moon and Earth

Facts about the Dwarf Planet Eris