Almost 10 years ago, a NASA spacecraft was able to take several photos of Pluto, known for decades as a planet before it was ...

Eris is similarly sized to Pluto, but it's three times further from the Sun than Pluto, sitting about 68 AU away. Eris is named after the Greek goddess of discord and strife, and the dwarf planet ...

It saw the discovery of dwarf planet Eris and how those very observations led to a new way to describe the Solar System and heralded the eventual change of Pluto’s planetary status. On that ...

Brown is the person who discovered Eris, a 10th solar system object that's about 27% more massive than Pluto. Some astronomers disagreed with the decision, with one going so far as to call it ...