Astronaut Jack R. Lousma, Skylab 3 pilot, participates in the August 6, 1973, extravehicular activity (EVA) -- aka spacewalk -- during which he and Astronaut Owen K. Garriott, science pilot, deployed the twin pole solar shield to help shade the Orbital Workshop. Note the reflection of the Apollo Telescope Mount and the Earth in Lousma's helmet visor.
During more than six years in operation, hundreds of experiments were done aboard Skylab, many of which paved the way for further human space exploration.
Circling 50 degrees north and south of the equator at an altitude of 435 km, Skylab had an orbital period of 93 minutes. Skylab fell from orbit on July 11, 1979, with much of the spacecraft burning up in the atmosphere, while some debris rained down in Western Australia.