The combined crews of space shuttle Discovery (in light blue shirts) and the International Space Station (in black) pose for a group shot — expected to be the last time 13 people are aboard the outpost.

NASA pared down the size of its last three shuttle crews to six instead of seven astronauts to save weight (each crewmember requires several hundred pounds of supplies) which frees up space for more station gear.

Discovery is scheduled to leave the station on Saturday and return to the Kennedy Space Center on Monday.

Pictured clockwise from top: station flight engineer Soichi Noguchi, with the Japan

Aerospace Exploration Agency, spacewalker Clayton Anderson, Russian cosmonaut

Mikhail Kornienko, former schoolteacher , Dorothy Metcalf-Lindenburger,

cosmonaut Alexander Skvortsov, Stephanie Wilson, station commander Oleg Kotov, lead

spacewalker Rick Mastracchio, T.J. Creamer, JAXA astronaut Naoko Yamazaki,

Tracy Caldwell Dyson, pilot James Dutton and center, shuttle commander Alan

Poindexter.

Credit: NASA