The seven astronauts are winding up a 13-day mission that was highlighted by the successful installation and unfurling of the space station's last pair of solar wings. The $300 million addition brought the orbiting outpost up to full power. It's an essential part of NASA's plan to double the space station population by late spring and boost the amount of science work.
Discovery is bringing back former space station resident Sandra Magnus. She's spent 4 1/2 months in orbit.
The space station, meanwhile, is getting more guests Saturday with the arrival of a Russian Soyuz capsule.