Anchored on the International Space Station's Canadarm2 some 240 miles above the blue and white Earth, astronaut totes one of the S0 (S-zero) keel pins, which were removed from their functional position on the truss and attached on to its exterior for long-term stowage. 13 April 2002 (NASA Media Archives). Buy this as a superb wall poster, a canvas print or a framed print.