Everyone's favorite dwarf planet, Pluto, was discovered just 95 years ago. Here's the story of how the once-ninth planet was ...

He spotted Eris in the Kuiper belt – a region of icy objects beyond Neptune. It was more massive than Pluto and left astronomers with a dilemma, whether to add it and other larger bodies ...

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 ...