Identity Theft and other stories (collection)

To send hunter-gatherers to the Moon might seem, well, lunatic: establishing a colony of the least technologically advanced people in a place where technology was the only thing making life possible. But we rationalized that we were actually being beneficent: with their hearts laboring under gentle lunar gravity, they would likely live decades longer, and their elderly—who, on the African veldt, had had no access to artificial hips or even wheelchairs—would be far more mobile than they had been on Earth.

More: we no longer cared what happened to Earth’s ecosystem, and, indeed, we knew that the inevitable impact of an asteroid would eventually cause worldwide calamity here. The Last Tribe, of course, could do nothing to avert a meteor strike, and we, no longer physical, could do nothing on their behalf. But now that they were on the airless, waterless moon, only a direct hit to their domed ecosystem would do any real damage. We had likely granted their civilization tens of millions of years of additional life.

Safety for us, and a better life for them.

It should have been a win-win scenario.

* * *

Prasp fashioned his wings from elephant skin spread between elongated wooden fingers. When Kari, his woman, helped him strap the wings to his arms, they stretched several times as wide as Prasp was tall.

The old stories, handed down now for a thousand generations, told of wind, the invisible hand of one of the gods moving through the air, pushing things about. But wind, like the stars of legend, did not exist here; Prasp wondered, despite the spellbinding stories he’d heard, whether it had ever existed even in Kata Bindu, the Old Place. Indeed, he wondered whether the Old Place itself was a myth. How could lights—and even orbs, one of fire, another of stone—have moved across the sky? How could people have weighed five or six times as much as they do here? The ancients were said to have been no bulkier, indeed, to have if anything been shorter, than people of today. By what magic could they have acquired additional weight?

Regardless, Prasp was pleased that his weight was what it was. Even with the great wings he’d built, he could barely get aloft. Yes, they did well for gliding from tree to tree—on those rare occasions when he managed to climb a tree without damaging his fragile contraptions. But to take to the air as the birds did still eluded him. Oh, even without the wings, Prasp could jump twice his own body height. But he wanted to go much higher than that.

Prasp wanted to touch the center of the world’s roof.

* * *

It was easy enough for us, for—The Uploaded; yes, that’s what we’ll call ourselves—to access information. Indeed, for us, to wonder was to know.

We knew that the refuge for the last primitive humans was in Copernicus, a lunar crater ninety-three kilometers wide. The roof over it consisted in part of two transparent silicone membranes, the outer of which was coated with 2.5 microns of gold. That gold layer was thin enough to screen out UV and other radiation, while still letting most visible light through—sunglasses for the entire sky.

Between those two membranes was a gap twelve meters thick filled with pure water. Transparent gold, transparent membranes, transparent water—the only thing that should have marred the primitives’ view upward from the inside of the dome was the crisscrossing network of load-bearing titanium cables, which divided their sky into a multitude of triangles.

If the water only had to shield the habitat from solar radiation, a thickness of 2.5 meters would have been enough. But this multilayered transparent roof—appearing almost flat, but really a section out of a vast sphere— had to contain the habitat’s atmosphere, as well. The air inside was almost pure oxygen, but at only 200 millibars: quite breathable, and no more prone to supporting combustion than Earth’s own atmosphere, which had a similar partial pressure of O₂.

Still, even that attenuated atmosphere pressed upward with a force of over two tonnes per square meter. So the water shield had been made twelve, rather than two-and-a-half, meters thick; the air pressure helped keep the roof up, and the water’s weight eliminated stresses on the inner silicone membrane that would have otherwise been caused by the atmosphere trying to burst out into the vacuum of space.

It was a simple, elegant design—and one that required virtually no maintenance. But there was one more component to the roof, a topmost layer, an icing on the transparent cake. A thin film had been applied overtop of the gold-covered outer membrane, a polarizing layer of liquid crystals that, under computer control, simulated a night of Earthly length by making the dome opaque for eight out of every twenty-four hours during the two-week-long lunar day. It also darkened the sky during the fourteen-day-long lunar night when the Earth was full or nearly full.