I obviously understand that NASAs analysis is superior to the rants made on this thread by clueless people who enjoy being rude to others. Recall NASA said ice could be used for shielding. Ice domes have been made on Earth and will be made on Mars. Glaciers have been identified and methods used in the arctic to build ice shelters are directly applicable to Mars. Obviously given the low gravity of Mars we can build far larger domes and illuminate them with inflatable concentrators using optical fibers.