February, Bruce McCandless II tests out the Manned Maneuvering Unit (MMU), a nitrogen-propelled backpack. He was the first astronaut to travel through space untethered.
the mission, the first flight of space shuttle Endeavour, set a record for the first (and only, to date) spacewalk involving three astronauts. The mission also featured a few other firsts.
A year and a half ago, Pluto was a pixellated blur. The New Horizons mission has revealed it as the geologically active center of a dwarf planet system.