Watch NASA astronauts Kayla Barron and Thomas Marshburn venture outside the International Space Station on Dec. 2 to replace a faulty antenna system. The antenna recently lost its ability to transmit low-rate voice communications and data to flight controllers in mission control, although it has had a limited impact on operations. The two astronauts will replace it with a spare. The spacewalkers are expected to turn their spacesuits on to battery power at about 10:30 UTC for an excursion slated to last about 6.5 hours. Marshburn will serve as extravehicular crew member 1 (EV 1), wearing a spacesuit with red stripes, and Barron will be extravehicular crew member 2 (EV 2), wearing a spacesuit with no stripes. European Space Agency astronaut Matthias Maurer will provide support from inside the orbiting laboratory, maneuvering the Canadarm2 robotic arm that will carry Marshburn. This will be the fifth spacewalk for Marshburn, and the first for Barron.