Eris is also substantially denser than Pluto, which suggests that it is composed mostly of rocky materials. Unlike Pluto, which is somewhat reddish in color, Eris appears almost grey.

The ERIS image of NGC 1097 is dominated by the galaxy's dusty inner ring, ... green, red and magenta with this last color highlighting the compact regions in the ring.

Eris is the largest known dwarf planet in the solar system. It is a trans-Neptunian object (TNO), orbiting the Sun in a region of space known as the scattered disc, just beyond the Kuiper belt ...

On Jan. 5, 2005, Eris was discovered. It was considered the largest known dwarf planet in the solar system until a year later when Pluto was downgraded from being a planet.

Dwarf planet Eris, similar in size to its better-known cosmic cousin Pluto, has remained an enigma since being discovered in 2005 lurking in the solar system's far reaches. While Pluto was ...