Editing Skylab (section)

=== Skylab Revisit ===
In 1971, before Skylab launched, NASA studied the potential of adding another mission to the three already planned. Called Skylab Revisit, two options were examined. First was an open ended mission that would launch within 30 days after Skylab 4, aiming to last 56 days. The second would visit the station a year after the last crew had left to determine the health and habitability of the station after two years in space.

Neither option was rated highly. The first option's chance of mission success was considered uncertain at best, and the second's even worse given the expected dearth of food, water, and oxygen supplies and the degraded condition of Skylab's system after two years in orbit.{{r|frielingv5no4}}