Building a base on the Moon will only be possible and feasible if the main cost factor - mass to be transported from Earth - is minimized. In this respect, one key technology is the use of in-situ resources, i.e. the use of the locally available resources on the Moon. The most obvious use for indigenous resources is for construction purposes.
The lunar surface has a layer of fine particles that are easily disturbed and placed into suspension. These particles cling to all surfaces and pose serious challenges for the utility of construction equipment, air locks, and all exposed surfaces. This lunar dust is very abrasive and extremely hazardous if it gets into the lungs.
The Apollo missions experienced many problems associated with lunar dust contaminating the Lunar Module and surface equipment.
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