The International Space Station is seen in this view from the space shuttle Discovery after the undocking of the two spacecraft in this photo provided by NASA and taken March 7, 2011. [Photo/Agencies]
Space shuttle Discovery and its remote manipulator system/orbiter boom sensor system (RMS/OBSS) is seen in this image taken March 6, 2011. The earth's horizon is seen in the background. [Photo/Agencies]
