This story was updated at 7:45 p.m. ET, Nov. 9. Subscribe to read this story ad-free Get unlimited access to ad-free articles and exclusive content. The dwarf planet Eris — once thought to be the ...

WASHINGTON (Reuters) - 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.

Though the dwarf planet Eris on the edge of the solar system is much denser than Pluto, the two frigid worlds are nearly exactly the same size, a new study finds. Astronomers accurately measured Eris' ...

Mike Brown: At the time we talked last time we had already discovered it and the question was; is it a planet or is it not? This was the one that was bigger than Pluto, and so everybody knows what ...

Die-hard Pluto fans still seeking redemption for their demoted planet have cause for despair this week. New data show that the dwarf planet Eris is 27 percent more massive than Pluto, thereby ...

Eris is the largest dwarf planet in the Solar System, and the ninth largest body orbiting our Sun. Sometimes referred to as the “tenth planet,” its discovery is responsible for upsetting the ...

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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 explored by ...

Aptly named after the Greek goddess of conflict, the icy dwarf planet, Eris, has rattled the general model of our solar system. The object was discovered by astronomer Mike Brown of Caltech in the ...

Eris, the largest dwarf planet in our solar system, made headlines in 2006 when scientists reported that it was larger and heavier than Pluto. New measurements are suggesting that Eris may actually be ...