The document describes a scenario where a space crew has made an emergency landing on the moon 200 miles from their rendezvous point. They must rank 15 survival items in order of importance to make the journey. The two most important items according to NASA are oxygen tanks, which are needed for breathing, and water, which is lost through heavy sweating in the moon's light side. A stellar map is also critical for navigation as the moon's star patterns match Earth's.