 How often does the Lunar colony get supplies delivered from earth?
Once in two weeks Earth-time a rocketship came around the horizon from Lunar City with stores for the colony deep underground. When it was first found, scientists descended into it to examine the exposed rock-strata and learn the history of the Moon before its craters were made. There were air-tight bulkheads for safety, and a hydroponic garden to keep the air fresh, and all sorts of things to make life possible for men under if not on the Moon. He usually reached the moondozer about the time the ship began to brake for landing, and he watched it come in. At the same time, liquid air from another tank evaporated to maintain the proper air pressure in the shack.
 Every two weeks
 Every twelve days  Every three months  Once a month  Every two weeks