Christmas Eve spacewalk: NASA astronauts perform Space Station repairs

Live now: "Expedition 38 Flight Engineers Rick Mastracchio and Mike Hopkins are conducting the second in a series of spacewalks to replace a degraded ammonia pump module on the International Space Station's starboard truss. The spacewalk officially began at 6:53 a.m. EST and is scheduled to run about 6 hours and 30 minutes."

Watch live video below:

Watch live streaming video from spaceflightnow at

Space journalist Stephen Clark is live-blogging at at SpaceFlightNow with a play-by-play analysis of exactly what the spacewalkers are doing, and the problem-solving process under way.