Space Shuttle Spacewalk April 1983 Uncle Sam This infrared image from NASA's

This infrared image from NASA's Spitzer Space Telescope shows the Helix nebula

Photographed by the Bain News Service in 1908 on 5x7 glass plate negative

photographed by Harry Whittier Frees

with the San Francisco Bay in the foreground and the Pacific Ocean in the background

Space Shuttle Spacewalk April 1983 Uncle Sam This infrared image from NASA'sSpace Shuttle Spacewalk April 1983. Astronaut Bruce McCandless II, mission specialist, participates in an extravehicular activity a few meters away from the cabin of the shuttle Challenger during the STS 41B mission. He is using a nitrogen propelled hand controlled Manned Maneuvering Unit. This was the first time an astronaut performed a spacewalk without being tethered to the shuttle. Date: 7 18 08