While scanning the Pluto system for possible hazards to the approaching New Horizons spacecraft, astronomers using the Hubble Space Telescope have discovered a fifth moon orbiting the dwarf planet.
FULL STORY: http://science.nasa.gov/science-news/science-at-nasa/2012/13jul_pluto5/
RELATED VIDEO: http://www.youtube.com/watch?v=JtcIbJKZZQQ
