 Moon inhabitants must make all of the following considerations regarding their equipment EXCEPT:
The light from the star that died when the meteor was created fell on Earth before the first lungfish ventured from the sea. The shaft tried to tie itself into a knot, and the blades, damaged and undamaged were spit through the casing. The shadow line between day and night could be seen from the Moon to be drifting across Australia. Evans, who had no watch, thought of the time as a quarter after Australia. His drinking water—kept separate from the water in the reactor—might conceivably last just as long. Four days reserve—plus one is five—plus sixteen days normal supply equals twenty-one days to live. This one had a tank and coils of tubing in the center of a curved reflector that was positioned to radiate the heat of the steam into the cold darkness of space. This boiling lowered the temperature, and the condenser demonstrated its efficiency by quickly freezing the water in the tank. Then, if the pump wasn't blocked by ice, it would return the water to the boiler. It was three days' supply of water, if it had been carefully used. He felt a little guilty about this, because he had ordered that all doors in the survey building should remain closed except when someone was passing through them. This was to allow the air-conditioning system to function properly, and to prevent air loss in case of the highly improbable meteor damage. For example, because of an order of his stating that there would be no alcoholic beverages within the survey building, the entire survey was assured of a constant supply of home-made, but passably good liquor. Morning to him had no meaning at all, but he thought in the strictest sense that it would be morning on the Moon for another week. The solar furnace was a rough parabola of mirrors used to focus the sun's heat on anything that it was desirable to heat. It was used mostly, from sun-up to sun-down, to supplement the nuclear power plant. Three of the nine banks of mirrors would not respond to the electric controls, and one bank moved so jerkily that it could not be focused, and it threatened to tear several of the mirrors loose. All of 'em too small for Radar to pick up, and not enough for Seismo to get a rumble." "I doubt it," Cowalczk answered, "most of these were pinhead size, and they wouldn't go through a suit." "That could hurt," Cowalczk admitted, "but there was only one of them."
 Protection from extreme temperatures
 Protection from meteor showers and volcanic eruptions  The cost of rare materials imported from Earth  Protection from extreme temperatures  The ability to function with minimal water use