Study shows how icy outer solar system satellites may have formed
(PHYSorg.com Space & Earth)

Using sophisticated computer simulations and observations, a team led by researchers from the Earth-Life Science Institute (ELSI) at Tokyo Institute of Technology has shown how the so-called trans-Neptunian objects (or TNOs) may have formed. TNOs, which include the dwarf planet Pluto, are a group of icy and rocky small bodies-smaller than planets, but larger than comets-that orbit the solar system beyond the planet Neptune. TNOs likely formed at the same time as the solar system, and understanding their origin could provide important clues as to how the entire solar system originated.