The next generation of robot astronauts is on its way, and they are even faster, stronger and more dexterous than before. NASA and General Motors have unveiled Robonaut 2, a more advanced version of the original Robonaut built 10 years ago in a partnership between NASA and the Defense Advanced Research Project Agency. Its nickname, "R2," bears a striking resemblance to Star Wars' R2D2 — "a similarity we've noticed," said Ron Diftler, NASA's Robonaut project manager.