Astronaut and space-tweeter Chris Hadfield has been chatting with followers about today's ISS spacewalk all morning. Head on over to his profile while you watch NASA's video live feed of the spacewalk below.
It's no lazy Saturday on the International Space Station: astronauts Rick Mastracchio and Michael Hopkins have just begun the first of three spacewalks to fix a faulty cooling loop on the outside of the ISS. And you can watch it live.
Head on over to NASA TV for live video, including radio communication from the astronauts and explanation by NASA engineers here on earth. Today's mission is disconnecting the faulty pump circulating ammonia coolant through the ISS's external cooling lines. A second spacewalk on Monday will focus on connecting the replacement pump, and a final mission Wednesday will complete the repair using the ISS's giant robotic arm. Hey, if you're gonna work on a holiday, you should at least be able to play with some awesome toys! [NASA TV]