... The Busy Center of the Lagoon Nebula . ... A Shuttle Back Flip at the Space Station . ... Last week, crew members of the International Space Station (ISS) watched carefully as the Space Shuttle Discovery did a planned but unusual back flip upon approach. ... Has a tenth planet been discovered? A newly discovered object, designated 2003 UB 313 and located more than twice the distance of Pluto, is expected to be at least as large as Pluto and probably larger, given current measurements. ...