The first parts of the model for early housing on Mars have safely arrived at a remote site in the Arctic Circle, where they will be assembled into a space-age hut to house six faux-astronauts. The parts are a dozen 800-pound (360-kilogram) fiberglass panels that were successfully airdropped last week to the rocky Devon Island in Canada’s northernmost province. They will become the walls and roof of the Mars Arctic Research Station — a combination bunkhouse, laboratory, and home base for the kind of scientific work that astronauts may someday do on Mars.