Pluto has regained its position as the ninth largest body to orbit the…

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,… » 10/28/11 11:40am 10/28/11 11:40am