Mars in fiction the past; Mars is a setting rather than a goal. Mariner 4 in July 1965 found that Mars—contrary to expectations—is heavily cratered, with a very thin atmosphere. No canals were found; while scientists did not believe that Mars was a moist planet, the lack of surface water surprised them. Science fiction had so influenced real explorations of the planet, however—Carl Sagan was among the many fans who became scientists—that after Mariner 9 in 1971-1972, craters were named after Wells, Burroughs, and other authors. The Mariner and Viking space probes confirmed that the Martian environment is extremely hostile to life. By
Mars habitat Space medicine One idea for a Mars missions is a library sent to the surface of that planet. The Phoenix lander, which landed on the North polar surface of Mars in 2008, included a DVD library that was heralded as the first library on Mars. The Phoenix library DVD would be taken by future explorers who could access the content on the disk. The disc, both a memorial to the past and a message to the future, took 15 years to produce. The content on the disc includes "Visions of Mars". One idea for exploration is knowledge arks for space,