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 ...

Eris, a dwarf planet located approximately 95.6 AU from the Sun, was discovered in 2005 after a re-analysis of data initially collected in 2003. Its discovery contributed to the 2006 International ...

Your 1996 column on the mysterious giant Planet X some astronomers thought might lurk beyond Pluto is in need of an update. In particular, you should tell the story of the dwarf planet Eris, whose ...