Long ago, Mars was a thriving, bustling planet. Its three billion inhabitants lived in peace and harmony, enjoying the fruits of an industrialized society. They had even ventured out into space, having managed to send their very first satellite into orbit. They had hoped to find their place in the universe. What they discovered was an asteroid.
They glimpsed it as it passed by the third planet at a leisurely 95,000 km per hour, the asteroid's mass causing only minor perturbations in their sunward neighbor's gravity. Earth's inhabitants did not notice this, the most advanced of them having only just mastered the casting of iron. Martians did not know that the blue planet held life, although many writers of speculative fiction posited that there might be. They often fancifully referred to their imaginary creations as little green men, for what else could live on a planet that was almost entirely covered by water?
The maths involved in calculating the asteroid's trajectory were fairly basic, even with the gravitational pulls of three moons—their planet lay directly in its path. Moving at breakneck speed, the Martian people used every minute of the twenty-four days they had to prepare for the worst, fully knowing that the worst was more than they could possibly cope with.
The asteroid did not hit Mars, at least not directly. It slammed into its largest moon, pulverizing it, millions upon millions of tonnes of rock splattered outward into the solar system—the birth of the asteroid belt. Not all of the collateral damage caused by the celestial nine-ball game ended up cruising towards Jupiter, however. A measly one-tenth of one percent of the impact debris was propelled planet-side, the vast majority of it vaporizing as it entered Mars's atmosphere. The remaining white-hot rock that had made it through was more than enough to destroy all life on the surface a hundred times over.
But not
below
the surface. Having had at least a little warning, the Martians had moved as much of their population, culture, and technology as deep below ground as they could in as many places as they could. It wasn't enough. Those who had been chosen to survive, smart and tough as they were, were no match for the buckling of tectonic plates and the violent shifting of the major land masses.
When all was said and done, only one group of Martians managed to ride out the cataclysm, in an enclave near the equator. Just one ten-thousandth of one percent of the original pre-Asteroid population of Mars survived to witness the birth of a second Stone Age.
Beaten, battered, and bruised, the remaining Martians did not give up, generation after generation clinging to life, clawing and scrabbling to survive out of sheer bloody-mindedness. And they did survive...just.
The few remaining clan lines—numbering just less than thirty thousand individuals—managed to carve out a life underground, a slow and laborious process. It took them almost three thousand years to restore their technology to pre-asteroid levels, but they did it, only to be hit with the final death blow—plague.
Like the asteroid, it did not affect them directly, the plague striking their animal population, specifically the ruminants. In three months' time every last mammal capable of producing milk was dead, the Martians' major source of calcium wiped out in a single season. There were still plant resources that they could turn to, but those resources were already strained. Conservative estimates, even with the implementation of stringent rationing, gave them slightly more than forty years to live.
Unable to feed their young, the Martians' backs were against a wall. An outside observer might wonder why Martian females couldn't make up the difference. They were certainly built for it, their mammary glands being quite sizable, a benefit of their planet's low gravity. On paper they should be able to, the males too, for Martians being clones by nature were built much alike, with only those key differences necessary to make procreation possible. But the ability to lactate, like other evolutionary traits such as prehensile tails or the ability to change one's skin color to match their environment, had been lost long ago.
Resigned to the certain death of their people and culture, a few Martians returned to the surface of their ruined planet, so that they might erect an antenna by which they might broadcast their plight to the universe, a beacon to attract anyone who might be listening. Of course they knew the chance of another species picking up their signal and being close enough to render aid in the time they had remaining was effectively zero, but still they had to try.
But effectively zero is not zero. They had only just begun construction on the antenna when an enterprising scientist thought it might be a good idea to listen first. To her astonishment, she heard a broadcast emanating only twelve and one-half minutes away—
the third planet held life!
Repeated forays upon the surface (wearing improvised pressure suits and using cobbled-together sensors) confirmed that their sunward neighbor teemed with life, and what was more the dominant life form was mammalian, not so very different from themselves.
Hope was kindled! The Martians rigged receivers on the planet's surface, watching and learning and studying every aspect of the alien beings, primarily by watching their television broadcasts, a primitive medium to say the least, though their black and white programming was possessed of a certain artistry.
The humans, for that was what the people of the third planet called themselves, were divided into two distinct genders. There were the males, who lacked functional mammary glands (as well as properly sized penises, if their artistic works were to be believed) and were generally bigger and stronger than the females, whose mammary glands were also similarly underdeveloped. And like themselves, the humans were omnivorous, sustaining—
gorging!