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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.
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.