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 ...

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. Subscribe to read this story ad-free ...

The second part of this question is much easier to answer than the first. We will definitely get a different number for Eris’ size once a spacecraft visits it. Spacecraft measurements can be thousands ...

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.

Astronomers from France have made the first accurate measurements of the distant dwarf planet Eris, and found that it's an almost exact doppelganger of the declassified ninth planet, Pluto. Eris was ...

Astronomers have accurately measured the diameter of the faraway dwarf planet Eris for the first time by catching it as it passed in front of a faint star. This event was seen at the end of 2010 by ...

Ex-planet Pluto just got a further demotion. Observations in 2005 had already revealed that it wasn’t the kingpin of the outer solar system: A more remote denizen called Eris has a diameter 5 percent ...

Add Yahoo as a preferred source to see more of our stories on Google. On January 5, 2005, astronomers at NASA discovered Eris, the second-largest dwarf planet in the solar system. Eris is just ...

Astronomers have measured the diameter of the dwarf planet Eris by catching it as it passed in front of a faint star. This was seen by telescopes in Chile, including the TRAPPIST telescope at the ...