The evidence from our orbital images shows that there was liquid water on the surface of Mars for about a billion years of the planet's early history… - Robert Zubrin

If the human mind can understand the universe, it means the human mind is fundamentally of the same order as the divine mind. If the human mind is of the same order as the divine mind, then everything that appeared rational to God as he constructed the universe, it's "geometry," can also be made to appear rational to the human understanding, and so if we search and think hard enough, we can find a rational explanation and underpinning for everything. This is the fundamental proposition of science.

Thus, the central objection raised against the human settlement and terraforming of Mars: Such projects may be technologically feasible, but there is no possible way that they can be paid for. On the surface, the arguments given supporting this position appear cogent, for Mars is a distant place, difficult to access, and possesses a hostile environment that holds no apparent resources of economic value. These arguments appear ironclad, yet it must be pointed out that they were also presented in the past as convincing reasons for the utter impracticality of the European settlement of North America and Australia.

Virtually every element of significant interest to industry is known to exist on the Red Planet. 1 With its twenty-four-hour day/ night cycle and an atmosphere thick enough to shield its surface against solar flares, Mars is the only extraterrestrial planet that will readily allow large-scale greenhouses lit by natural sunlight. Mars can be settled. For our generation and many that will follow, Mars is the New World.