dead; perhaps one day men would bring her to life, but that would be in the far, far future, with
the aid of technologies yet unborn.
There remained Mars, source of so much mystery and romance, perhaps the only other home of
life in the Solar System. After heartbreaking failures, a TV scanner was landed on the planet, and
the whole world peered from forty million miles away, through a single mobile eye rolling jerkily
across the desolation of the misnamed Lake of the Sun.
No one who saw will ever forget that first encounter between Martian and machine. Undramatic,
absolutely silent, it was one of the great moments of history. Advancing slowly on its broad
balloon tires, its vision turret rotating continuously, the exploring robot moved with mindless
purpose over a dry, dusty plain. It was on its own, beyond aid or advice from Earth. The scenes
its makers were watching were already four minutes in the past: any orders they might send, though
racing at the speed of light, could not reach Mars until as many in the future.
The plain was covered with large, spherical boulders, and the robot was rolling straight
toward one. Its builders were not worried; the machine's obstacle-detecting skirt would warn it
before there was danger of collision, and it would automatically turn off at a right angle. That
was the theory; what happened was somewhat different.
Before the robot could reach it, the boulder moved. It heaved itself off the ground on a
myriad stumpy legs, crawled slowly out of the track of the advancing explorer, and settled down
again. As it plunged forward, unaware of the consternation it was causing on Earth and Mars, the
robot disturbed two more of the boulders; then it was through them, and encountered no others
until, ten hours later, it became trapped in a canyon and continued to radio back maddeningly
repetitious views of bare rock until its batteries failed.
But it had done its work; it had detected life on Mars- life, moreover, of a fairly advanced
form. Whether animal, vegetable, or neither, was a question that would not be answered for years-
until the first expedition reached the planet in the mid-80's.
The early explorers knew that they would find life: they could only hope that they would find
intelligence. But Mars has as much land area as Earth-for though it is a small world, it has no
seas. Even to map the planet adequately would take decades; to learn all its secrets would be the
work of centuries.
The main Martian life-forms-the "roving stones" browsing on the mineral deserts, the
leechlike predators that hunted them in the desperate battle for existence, the yet fiercer
parasites that preyed on them-showed only the dimmest flickers of intelligence. Nor was there any
sign that these were the degenerate survivors of superior creatures, Mars, it appeared certain,
had never been the home of Mind. Yet there were still-many who hoped that somewhere in the endless
crimson deserts or beneath the frozen poles, or sealed in the eroded hills there might yet be
found the relics of civilizations that had flourished when the giant reptiles ruled the Earth. It
was a romantic dream, and it would be slow to die.
Beyond Mars, there were greater worlds, and mightier problems. Enigmatic Jupiter, with a
thousand times the bulk of Earth, teased the minds of men with its mysteries. Perhaps there was
life far beneath those turbulent clouds of ammonia and methane, thriving in the hot darkness at
pressures unmatched in the deepest terrestrial seas. If so, it would be as unreachable as another
universe; for no ship yet imagined could fight its way down through that immense gravitational
field, or withstand the forces that were raging in the Jovian atmosphere. Some robot probes had
been launched on that fearful journey; none had survived.
One day, perhaps in the early years of the new century, there would be manned expeditions to
the moons of Jupiter-to Io, Europa, Ganymede and Callisto, the beloved of the father of the gods,
large enough to be called planets in their own right. But there was so much to do nearer home,
with the buildup of the lunar colony and the establishment of a bridgehead on Mars, that the outer
worlds must wait. Though there would be robot fly-by missions to all the giant planets, and even
out into the comet-haunted darkness beyond Pluto, no men would travel on these lonely flights.
As for voyaging outside the Solar System, to the still undiscovered planets of other stars,
few scientists believed that it would ever be possible. At the best, interstellar travel was
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