NASA astronauts Kjell Lindgren and Scott Kelly back train for the capture of an unmanned Cygnus vehicle.

NASA astronauts Kjell Lindgren (front) and Scott Kelly (back) train for the upcoming robotic capture of an unmanned Cygnus cargo vehicle. Orbital ATK will launch its fourth resupply mission to the International Space Station on Dec. 3. On Dec. 6, Lindgren and Kelly will use the station’s large Canadarm2 robotic arm to reach out and capture the vehicle. Cygnus will deliver more than 7000 pounds of research equipment and supplies for use by the Expedition 45 and 46 crews.