WATCH LIVE @ 2pm: NASA Previews Space Station Spacewalks

Astronauts at the International Space Station will take two spacewalks this month to perform upgrades to the station's power system. NASA TV will air a briefing today at 2 p.m. EST (1900 GMT) to preview the upcoming extravehicular activities. For the first spacewalk on  Friday, Jan. 6, NASA astronauts Shane Kimbrough and Peggy Whitson will spend about 6.5 hours working outside the orbiting laboratory.