zero at night
Then he would pick up three marsuits and walk back across the desert to the Canfell Hydroponic Farm . Dark walked across the desert toward the Canfell Hydroponic Farm . He had discarded the marsuit he had been wearing , and substituted for it a light loincloth torn from one of Goat Hennessey 's sheets . This reverse reaction , in a temperature that would be uncomfortably chilly for a fully clothed man and descended far below zero at night , resulted from his recognition that he gained a tremendously greater direct influx of energy from the total exposure of his skin to the sunlight . He could feel the energy penetrating his flesh , building up in him . And , with this energy , the low temperature did not bother him . Behind him , by a rope , he dragged a little two-wheeled cart he had constructed from groundcar parts .