Space ShuttleSpace Shuttle Discovery is launched on the 123rd shuttle flight, a two-week mission to install a major laboratory module to the International Space Station. The pressurized module of Japan’s Kibo laboratory joins the unpressurized section installed on a previous flight, complete with its own robotic arm controlled inside. Aboard Discovery for her 35th flight are Commander Mark Kelly, Pilot Ken Ham, mission specialists Karen Nyberg, Ron Garan and Mike Fossum, and Japanese astronaut Akihiko Hoshide, who remains on the International Space Station. Station astronaut Garrett Reisman returns to Earth aboard Discovery.