Changes

Author [[Edgar Rice Burroughs]] published several novels speculating on an elaborate civilization on Mars to which humans traveled, but which was not bent on invading the earth. Author [[C. S. Lewis]], in his novel ''Out of the Silent Planet'', envisioned Mars as the home of three races of non-fallen beings that were instructed to regard the earth as off-limits on account of man's [[fall of man|fallen nature]].

Author [[Edgar Rice Burroughs]] published several novels speculating on an elaborate civilization on Mars to which humans traveled, but which was not bent on invading the earth. Author [[C. S. Lewis]], in his novel ''Out of the Silent Planet'', envisioned Mars as the home of three races of non-fallen beings that were instructed to regard the earth as off-limits on account of man's [[fall of man|fallen nature]].

With the abandonment of the Lowell canal theory, science fiction authors and dramatists envisioned Mars as home to a human colony. But at least one motion-picture producer saw Mars as a place that very ancient [[astronaut]]s had once visited. These astronauts, according to this scenario, left behind some advanced equipment that a human rebel was subsequently able to use to give Mars a breathable atmosphere and thus facilitate the Martian colony's liberation from the venal and tyrannical civilization on earth.

With the abandonment of the Lowell canal theory, science fiction authors and dramatists envisioned Mars as home to a human colony. But at least one motion-picture producer saw Mars as a place that very ancient [[astronaut]]s had once visited. These astronauts, according to this scenario, left behind some advanced equipment that a human rebel was subsequently able to use to give Mars a breathable atmosphere and thus facilitate the Martian colony's liberation from the civilization of earth, which in the story had become venal and tyrannical.

=== Speculation on microbes ===

=== Speculation on microbes ===