When scientists first discovered the dwarf planet Eris back in 2005, they claimed that the icy body was actually larger than Pluto. But when Eris' orbit passed in front of a dim star late last year, astronomers got their first chance to take a good hard look at the dwarf planet's actual diameter. And as it turns out, Eris and Pluto are almost identical in size; in fact, Pluto might actually be just a little bit bigger.
We first reported on the team's findings about a year ago, but until recently the researchers' analyses had yet to be confirmed by a peer review process. Now, however, their results appear to be official; the team's conclusions were published in the October 26th issue of Nature.