okt 102013
 
Orbital Ballet of Pluto's Moons Hint of Long-Ago Collisions

  A large impact 4 billion years ago may account for the puzzling orbital configuration among Pluto’s five known satellites, according to a new model developed by planetary scientists from Southwest Research Institute (SwRI). Pluto’s moonsystem. Image Credit: NASA/ESA Starting with Charon, Pluto’s nearest and largest moon, each of the successively more distant — and much [continue reading]