The Hubble telescope has discovered a fourth moon around Pluto. The moon, tentatively called P4, joins Hyrdra, Nix and Charon. Pluto was demoted from planet to dwarf planet in 2006. It's also the only one of the original nine planets that NASA hasn't visited. That's why this find is important.
First it shows that Hubble can image even tiny objects in space and second, it provides the NASA's New Horizons mission headed to Pluto with a better lay of the land. The unmanned New Horizons spacecraft is about halfway to Pluto and is expected to arrive in July of 2015.The Presurfer