Semper Human. Ian Douglas

       Associative Marine Holding Facility 4

       Eris Orbital, Outer Sol System

       1919 hours, GMT

      Garroway tried to make sense of what he was seeing. The central mass resembled nothing so much as an immense, impossible, blossoming rose of streaming, blue-white radiance, imbedded within a confused tangle of blinding light, of far-flung arcs and walls and swirls of hot clouds of molecular gas, of stars showing comet tails streaming away from the central blast, of nebulae torn asunder by ferocious stellar winds, of objects set in such a titanic scale that stars and even clusters of stars were dwarfed to insignificance. His implant began overlaying what he was seeing with identifying blocks of text.

      Humans had last visited the center of the Galaxy in 1111 of the Marine Era … the year 2887 by the old calendar. Marine and naval forces had assaulted a major Xul base, a number of bases, actually, located in and around the Core structures. The largest and most important of these had been a Dyson cloud, a swarm of trillions of Xul artificial wordlets positioned around the supermassive black hole that marked the Galaxy’s exact gravitational center. At the climax of the battle, a red giant star called S-2, in close orbit around the central black hole, had been nudged from its high-velocity path by inducing a partial and off-center collapse beneath its surface, triggering an outrushing jet of stellar material that had acted like an immense rocket blast. The fast-dwindling star had fallen closer to the black hole than otherwise would have been the case, sweeping through part of the Xul cloud, then shredding as it whipped around the inner gravitational singularity and down the cosmic drain at the center.

      The Xul hyperstructure had been destroyed, the individual elements of the cloud plunging into the black hole in an eye’s blink because they’d been force-beam anchored in place, rather than circling in orbit. Much of the infalling matter had been swallowed of course, but much more had rebounded outward, generating what had come to be known as the Core Detonation, an out-rushing surge of tortured plasma so hot and bright that a supernova would have been lost in the glare.

      A nearby star cluster, young and hot, just a tenth of a light year out, had been consumed in the fury weeks later, the stars pop-pop-popping into a chain of supernovae as the flood of radiant energy engulfed them. Other supergiant stars close to GalCenter had been swept up as well, adding their mass as fuel to the maelstrom of radiation.

      That had been 1117 years ago. In those eleven centuries, the blast wave had swept outward, the wavefront of electromagnetic radiation traveling 1117 light years in that time, the somewhat slower, following squall of high-energy particles crossing about 900 light years in the same period of time. Stars, thousands of them caught in that deadly firestorm of energy, had exploded as they were engulfed, each adding its own bit of fury to the storm. The Galactic Core was now a seething ocean of blue-white hell, and it was still expanding.

      Any Xul nodes located within that central, two-thousand-light-year-wide pocket of hell, would have been swept up and consumed. The question was how far the blast would expand … how much of the Galaxy might it devour?

      “So,” Garroway wanted to know, “is that stuff going to hit us in another twenty, twenty-five thousand years?” The thought that Humankind’s attack on the Galactic Core eleven hundred years ago might actually have unleashed a beast that was going to devour the entire galaxy was horrifying.

      “It’s attenuating,” Schilling told him. “Twenty-six thousand years, or a little less, after the original Core detonation, the electromagnetic wavefront will pass Earth at the speed of light. Long before that happens, the heavier charged particles and plasmas, the hard, dangerous stuff, will have been absorbed by intervening clouds of dust and gas.”

      “Even so,” a new voice said, “the astrophysicists are calling it a microquasar. It won’t scour the Galaxy of life, fortunately, but they estimate the total light output from our Galaxy will more than quintuple, and probably set the astronomers in Andromeda to scratching whatever they use for heads.”

      “General Garroway,” Schilling said, “this is Socrates. He’s your AI liaison with the Council of Lords.”

      “Pleased to meet you, General,” Socrates said. The voice was mellifluous and deep, a rich baritone. Where Schilling spoke with a slight accent, Socrates’ Anglic was perfect.

      Well, he was an AI. He would be perfect in every way possible.

      “Hello, Socrates,” Garroway said. “The pleasure is mine. Or do AIs feel emotion now?”

      The AI chuckled. Either it had a genuine sense of humor, or was programmed to mimic one quite well. Garroway did wonder how far artificial intelligence had developed in the past eight centuries.

      “If you can’t tell the difference,” Socrates told him, “and if I can’t tell the difference, what’s the difference between my feelings being programmed or natural?”

      “Point.”

      “Socrates is a Star-level artificial sentience,” Schilling explained. “That means he’s at least as bright as the smartest s-Human, but much faster. We refer to them as our archAIngels.” Schilling pronounced the word “archangel,” but Garroway sensed the neologism within, and the meaning behind it. “Sometimes I think they are the real rulers of the Human domain now.”

      “We all do what we can,” Socrates said. Garroway blinked. A modest AI? Or was that simply another aspect of its programming?

      “There was quite a bit of speculation about how serious the Core Detonation was,” Schilling said, picking up on the earlier topic. “That was, oh, four or five centuries ago, when we started getting hard data about the expanding Core wavefront. Created a bit of a minor panic, in fact, according to the history downloads.”

      “If we managed to turn our own Galaxy into even a small quasar,” Garroway said, “I’d think a little judicious panic might be called for.”

      A quasar was a galaxy with an exceptionally bright nucleus, an active core that outshone the rest of the galaxy by a hundred times or more. Quasars were also extremely distant. The closest known was three-quarters of a billion light years away … which meant it was also a glimpse of something that had happened three-quarters of a billion years in the past, ancient cosmic history. Accepted astrophysical theory suggested that many or, perhaps, all large galaxies had gone through a quasar phase early in their evolution, some billions of years ago, as the supermassive black hole at their cores devoured suns by the millions, spewing out the residue as fantastic bursts of high-energy radiation, a blazing beacon visible across all of time and space. Eventually, the core of the galaxy would be pretty well cleaned out, except for the central black hole itself, of course, and the galaxy would settle down to being a normal, well-behaved member of the cosmic community.

      Presumably, the Milky Way Galaxy had been through such a phase some billions of years ago; the supermassive black hole at the Core was an ancient quasar, slumbering and quiescent now that much of the matter at GalCenter had been devoured. But then the Commonwealth Fleet and the Fleet Marines had come along late in the twenty-ninth century and upset the delicately balanced megastructure the Xul had constructed at the Core.

      And a shadow, at the very least, of the ancient monster had awakened once again.

      “It should be spectacular, though,” Schilling told him. “When the light gets this far out, our night skies will be incredible in the direction of Sagittarius. We think there will be enough light streaming out from the Core that you’ll be able to read by it.”

      “The slower, heavier particles will pile up into the gas clouds that surround the Galactic Hub and create shock waves over the next five to ten thousand years,” Socrates added, “triggering an incredible burst of star formation. The Galaxy, in toward the Core, is going to be an amazing, beautiful sight for ten thousand years or more afterward.”

      “Maybe I should go back into cybe-hibe,” Garroway said. “Wake me when the show starts.”

      “We’ll