Semper Mars(50)
“With the ancient-astronauts crowd, nothing is ever that simple.” Alexander chuckled. “Sometimes the ancient-astronaut guys really got carried away. One saw aircraft landing strips where the natives had cleared away dark surface pebbles to expose light-colored stones underneath. The Nazca lines, in Peru. They are incredible—huge drawings of animals and figures and geometric lines that can only be appreciated from the air.” He chuckled. “But don’t ever try to land your airliner there.”
“Don’t worry. I won’t.”
“What I always hated about those theories was the way they could so casually dismiss the natural inventiveness, the creativity, the cleverness of us humans. We’ve done some quite spectacular things on this planet, you know, without a scrap of help from aliens with antigravity beams. Most of the evidence offered to support those theories is ambiguous at best.”
“Yeah, but you said ‘mostly, no,’ when I asked if you believed. What part do you believe?”
“Well, you know, sometimes I wonder if we didn’t go too far in chucking everything those writers suggested. There are a few landmarks on Earth that probably weren’t built by the people we’ve always assumed built them, and there’s no decent explanation. The Temple of the Sun at Titicaca is one. The foundation at Baalbek in Lebanon is another. The complex at Giza, the Great Pyramids and the Sphinx, is a third. If aliens didn’t build the things, it’s at least possible they were inspired by, shall we say, visitors from someplace else. If I had to point to specific structures on Earth that I thought gave evidence that we’d been visited in the remote past, I’d point to those three.” Alexander grinned suddenly. “Of course, don’t tell my colleagues that. I’d be black-balled from the Loyal Fraternity of Diggers and Pot-Shard Hunters if they knew. Stripped of my official shovel and whisk broom and drummed out of the corps.”
“My lips are sealed. But tell me, off the record. Is there really any chance that aliens built those places?”
Alexander sighed. “I wish I could tell you. I wish I knew. If I’d been doing archeology in the last century, I’d have to say that the chances were, oh, I don’t know. Five percent. Once we demonstrated that the Face on Mars was no accident of light and shadow, the way they thought when they first photographed it from orbit, well, the chances went up quite a bit, you know? Fifty-fifty, maybe. Or better.”
Garroway blinked. “Why so much?”
“Because now we know that, once upon a time, there were aliens in the neighborhood. We know we’re not alone in the universe, and that one piece of information has already started to change everything about the way we look at ourselves, the way we think about our past and who we are and where we’re going.”
“Oh, I don’t know about that,” Garroway replied. “I think it’s interesting, sure…but you don’t see me joining any aliens-created-Man cults. I think most people will just, I don’t know, accept it and get on with their lives.”
“Maybe.” He didn’t sound convinced. “With me, though, I can’t help it, when I look at the stars now, thinking that there’s some sort of a connection. Between us and the stars. Something more than just the fact that we’re here.”
“Some of those groups back on Earth are claiming that humans are descended from a lost colony of aliens who got stranded here hundreds of thousands of years ago. Maybe what you found out there today supports that notion.”
Alexander laughed. “God, I hope not! That’s one of the sillier ideas being bandied about right now. Man’s place in Earth’s evolutionary tree is very firmly established. Did you know that human DNA differs from chimpanzee DNA by something less than two percent?”
“No, I didn’t know that.”
“It’s true. Doesn’t mean we’re descended from chimps, of course. Just that they’re relatives, with the same great-great-granddad as us. Not only that, but we’re just too well adapted to the local ecology…from what we eat to the symbiotic relationship we have with bacteria in our guts. If early humans had come from another world, well, chances are they wouldn’t even have been able to eat the local food. Even if their body chemistries were based on sugars and amino acids, there’d be just a one-in-four chance at best that they’d be able to digest the stuff they found growing here. Isomers.”
“Isomers?” Garroway made a whizzing motion with his hand above his head. “You lost me.”
Alexander was warming to the topic, growing enthusiastic. Garroway guessed that he was working off frustration accumulated in the meeting. “Some molecules have mirror-image versions of themselves. Same molecule, made of the same atoms, but structurally reversed. Biochemists talk about left- or right-handed molecules. Sugar, for example—we use right-handed sugar. That’s where we get the name dextrose, in fact. We can’t digest levo-sugars. They pass right through without doing a thing, because we’ve evolved to use the right-handed form. At the same time, we use levo-amino acids and can’t digest the right-handed ones. And, so far as we can tell, whether a given planetary ecology evolves with right-handed or left-handed isomers of all the various organic molecules is purely a matter of chance. Toss a coin.”