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Photos: Walking above the clouds

Space shuttle Discovery astronauts take three space walks to upgrade the space station and test emergency repairs.
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1 of 5 Bill Detwiler/ZDNet

Clouds

Space shuttle Discovery astronauts took three space walks to upgrade the International Space Station and test emergency repairs.

During the first space walk Astronaut Piers J. Sellers hangs from the bottom of a 100-foot Remote Manipulator System/Orbiter Boom Sensor System. The astronauts successfully tested the space crane that will allow them to reach new locations on the space shuttle or International Space Station. See more Discovery photos.

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2 of 5 Bill Detwiler/ZDNet

Space station upgrades

During the second space walk, which lasted for almost seven hours, astronauts Michael E. Fossum (center) and Piers J. Sellers (you can see his backpack right) repaired the Mobile Transporter rail car and delivered a spare pump module for the International Space Station.

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3 of 5 Bill Detwiler/ZDNet

Fixing tiles

Astronauts Piers Sellers and Mike Fossum took a third space walk on Wednesday to test procedures for emergency repairs. The two took infrared video to see if damage within the shuttle's reinforced carbon panels could be detected.

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4 of 5 Bill Detwiler/ZDNet

Applying sealant with putty knife

The space shuttle brought damaged panels to see if astronauts could repair them in orbit using a substance called NOAX--a pre-ceramic polymer sealant containing carbon-silicon carbide powder. Their tools, a caulk gun and spatulas.

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5 of 5 Bill Detwiler/ZDNet

Group shot

The weightless Discovery crew poses for a head-to-head photo shoot. From the bottom left are astronauts Stephanie Wilson; Steven Lindsey, commander; and Lisa Nowak. From the top left are astronauts Piers Sellers, Michael Fossum, and Mark Kelly.

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