Tech.Luver writes: "NASA canceled a spacewalk Wednesday as it scrambled to deal with two power problems at the international space station. The spacewalk set for Thursday was supposed to deal with a malfunctioning rotary joint for the solar wings on the right side of the space station. Instead, the astronauts were informed that their next spacewalk would be Friday -at the earliest-and involve work with the station's ripped solar wing. Both issues are competing for the precious little spacewalking time that's left in Discovery's mission, which already was extended a day after the joint problem cropped up last weekend. The problems could delay future missions and make it even harder to finish building the orbiting outpost before the space shuttles must be retired. ( http://techluver.com/2007/10/31/nasa-delays-4th-spacewalk/ )"