Dark Matter. Ian Douglas

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      The best way to get a memetic virus through the noise and the defenses was to do so without the target being aware.

      “It is imperative that we end the civil war within the Confederation as swiftly as possible,” Konstantin went on. “A recombinant memetic attack on the Geneva leadership gives us a good chance of uniting Humankind before the Sh’daar or the unknown alien threat at Omega Centauri can act.”

      “But we still don’t have a clue as to how to defeat the Sh’daar,” Koenig said. “And we know even less about the Rosette Aliens.” He hesitated, thoughtful. “It’s the time-­travel aspect that bothers me, Konstantin,” he said at last. “With that one factor alone, they ought to be able to walk all over us.”

      The Sh’daar Collective was a truly formidable enemy. No human knew just how big the Collective actually was. At the very least, it included within its far-­flung embrace well over a thousand distinct star-­faring species scattered across perhaps a quarter of the galaxy, and controlled the resources of thousands more that for one reason or another had never ventured into space.

      The discovery that at least one TRGA cylinder gave direct access from the Milky Way at time now to the N’gai Cloud some 876 million years in the past added the dimension of time to the problem. What passed for a Sh’daar galactic government appeared to be based in what Confederation intelligence called Omega Centauri T-­0.876gy, the designation for the N’gai Cloud as it was almost 0.9 of a gigayear before time now, but it evidently had spread through time as well as space. How such a possibility could be made to work without endless complications from temporal paradox remained one of the great unsolved mysteries of galactic history.

      And with that kind of strategic advantage, one would think that the Sh’daar could have intervened at any point in Humankind’s history or even prehistory and written humanity out of existence. Suppose a Sh’daar battlefleet had showed up over the Earth of 876 million years ago, when terrestrial life—­still limited to bacteria and protists and blue-­green alga—­was confined to the sea. They could have glassed over the Earth, boiled away the ocean, bombarded what was left with high-­energy neutrons . . .

      Exterminated the life in those ancient terrestrial seas and Humankind would never have appeared.

      The fact that the Sh’daar had not eradicated all life on Earth by rewriting history suggested that there was more to the problem than was immediately obvious.

      The problem, Koenig thought, likely had to do with a key aspect of what it meant for species to be mutually alien. The Turusch, the H’rulka, the Nungiirtok, the Slan . . . all were client species of the Collective and all, at one time or another, technic species that had attacked human forces in Tprime, meaning time now, captured human interstellar colonies, and even launched assaults on Earth herself. And while there’d been attempts at joint operations—­the Nungiirtok were specialists in ground warfare, for example, and had invaded the colony on Osiris in conjunction with Turusch fleet elements—­the different Sh’daar clients were so different from one another—­in physiology, yes, but especially in psychology—­that they apparently had trouble coordinating military operations with one another. The Sh’daar guided their clients, or tried to, through the Seeds . . . but either the distances were too vast or the number of Seeds sending back data was too large. Whichever it was—­and it might well be both—­the Sh’daar Empire was not particularly efficient in the ways it dealt with ambitious upstarts like Humankind.

      Humankind, Koenig believed, possessed one vital advantage in its struggle with the Sh’daar, something he privately thought of as the Greek advantage. Koenig was a thoroughgoing student of history, and was among other things fascinated by the spectacular victories of the ancient Greeks over the far larger and more diverse Persian armies at Marathon, at Plataea, and, later, by Alexander the Great over Darius. Like the Greek city states of 2900 years earlier, modern Earth was far from united . . . but the member species of the Sh’daar Collective had so little in common with one another that communications—­even facilitated by Agletsch pidgins—­must be very nearly impossible.

      So far, Humankind had managed to use that essential disunity, beating Sh’daar client species in turn rather than en masse. The question, though, was whether the enemy would learn from those defeats and get their collective act together. If they did, when they did, humanity would be in very serious trouble indeed.

      Somehow, Earth needed to unite, and then end the Sh’daar threat once and for all. If Konstantin could pull that off with memegeneering, well and good. If he could not, then Humankind’s long-­term survival was very much in doubt.

      And so far as Koenig could tell, Humankind was running out of useful options.