EARTH Aboard the International Space Station -- 24 Jul 2009 -- This is a close-up view of the helmet visor of astronaut

EARTH Aboard the International Space Station -- 24 Jul 2009 -- This is a close-up view of the helmet visor of astronaut Christopher Cassidy during his second spacewalk on July 24. Seen mirrored in the visor is astronaut Tom Marshburn, with whom Cassidy will team again on July 27 for the STS-127 crew's fifth and final session of extravehicular activity. Eleven astronauts and cosmonauts remained inside the International Space Station and the shuttle to which it was docked, while the two suited astronauts continued work on the orbital outpost -- Picture by Lightroom Photos / NASA