S73-27729 (1 June 1973) --- Scientist-astronaut Joseph P. Kerwin, SkyLab 2 science pilot, floats with his body outstretched as he demonstrates weightlessness in the forward compartment of the Orbital Workshop of the SkyLab 1 & 2 space station cluster in Earth orbit, as seen in this reproduction taken from a color television transmission made by a TV camera aboard the space station. Astronaut Charles Conrad Jr., SkyLab 2 commander, is visible on Kerwin's right. The SkyLab 2 crewmen performed exercises while floating. Photo credit: NASA