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 ...

The discovery of Eris in the Kuiper Belt beyond Neptune in 2005 prompted the debate that ultimately reclassified Pluto as a dwarf planet. It was an interest in Pluto that drew UC Santa Cruz ...

In real life, Eris forced scientists to define a planet that eventually led to Pluto getting the boot. Soon after Pluto's dismissal from the club of classical planets, hundreds of scientists ...

Astronomers accurately measured Eris' diameter for the first time using observations made late last year, when they caught the dwarf planet as it passed in front of a dim star. The observations, made ...

2003 UB313, aka 'Xena,' whose discovery led to Pluto's demotion from planet status, officially renamed 'Eris' after Greek goddess of discord.

On September 7, astronomers at the IAU’s Minor Planet Center (MPC) in Cambridge, Massachusetts, added Pluto and Eris to its catalog. Pluto received number 134340, while Eris is 136199.

University of California, Santa Cruz Professor of Planetary Sciences Francis Nimmo recently co-authored a Science Advances paper about the internal structure of the dwarf planet Eris.