Watch Live: NASA Astronauts Step Outside ISS for Holiday Spacewalks

Two NASA astronauts have begun the first of three quickly planned spacewalks to fix a problem with the International Space Station's vital cooling system.

NASA astronauts Mike Hopkins and Rick Mastracchio ventured outside of the space station's Quest airlock Saturday to begin the repairs. The spacewalk officially began at 7:01 a.m. EST when the two astronauts took their spacesuits to internal power. NASA TV will broadcast the entire 6.5-hour EVA (extra-vehicular activity or spacewalk), and you can watch the spacewalk live on SPACE.com.

"It's a beautiful day," one of the astronauts said as he stepped outside of the orbiting outpost. Read more...