They won't be beaming GPS or radio signals back to Earth anytime soon, but these one-inch-square satellites could one day travel to distant planets -- without fuel. Developed over a period of three years by a team of undergraduates at Cornell University, the Sprite chips could eventually be used for communication, flying in clusters like tiny space plankton. After hitching a ride on-board the final space shuttle Endeavour mission this afternoon, the three prototype satellites will be mounted outside the International Space Station, where they'll sit f
