Dark and light matter passed like ghosts, touching each other only with gravity. But the pinprick gravity wells of the new baryonic stars were useful. Drawn into these wells, subject to greater concentrations and densities than before, new kinds of interactions between components of dark matter became possible.
In this universe, the emergence of life in dark matter was inevitable. In their earliest stages, these “photino birds” swooped happily through the hearts of the stars, immune to such irrelevances as the fusion fire of a sun’s core.
What did disturb them was the first stellar explosions — and with them the dissipation of the stars’ precious gravity wells, without which there would be no more photino birds.
Almost as soon as the first stars began to shine, therefore, the photino birds began to alter stellar structures and evolution. If they clustered in the heart of a star they could damp the fusion processes there. By this means the birds hoped to hurry a majority of stars through the inconvenience of explosions and other instabilities and on to a dwarf stage, when an aging star would burn quietly and coldly for aeons, providing a perfect arena for the obscure dramas of photino life. A little later the photino birds tinkered with the structures of galaxies themselves, to produce more dwarfs in the first place.
Thus it was that humans found themselves in a Galaxy in which red dwarf stars, stable, long-lived and unspectacular, outnumbered stars like their own sun by around ten to one. This was hard to fit into any naturalistic story of the universe, though generations of astrophysicists labored to do so: like so many features of the universe, the stellar distribution had been polluted by the activities of life and mind. It would not be long, though, before the presence of the photino birds in Earth’s own sun was observed.
The Xeelee had been troubled by all this much earlier.
The Xeelee cared nothing for the destiny of pond life like humanity. But by suppressing the formation of the largest stars, the birds were reducing the chances of more black holes forming. What made the universe more hospitable for the photino birds made it less so for the Xeelee. The conflict was inimical.
The Xeelee began a grim war to push the birds out of the galaxies, and so stop their tinkering with the stars. The Xeelee had already survived several universal epochs; they were formidable and determined. Humans would glimpse silent detonations in the centers of galaxies, and they would observe that there was virtually no dark matter to be observed in galaxy centers. Few guessed that this was evidence of a war in heaven.
But the photino birds turned out to be dogged foes. They were like an intelligent enemy, they were like a plague, and they were everywhere; and for some among the austere councils of the Xeelee there was a chill despair that they could never be beaten.
And so, even as the war in the galaxies continued, the Xeelee began a new program, much more ambitious, of still greater scale.
Their immense efforts caused a concentration of mass and energy some hundred and fifty million light-years from Earth’s Galaxy. It was a tremendous knot that drew in galaxies like moths across three hundred million light-years, a respectable fraction of the visible universe. Humans, observing these effects, called the structure the Great Attractor — or, when one of them journeyed to it, Bolder’s Ring.
This artifact ripped open a hole in the universe itself. And through this doorway, if all was lost, the Xeelee planned to flee. They would win their war — or they would abandon the universe that had borne them, in search of a safer cosmos.
Humans, consumed by their own rivalry with the Xeelee, perceived none of this. To the Xeelee — as they fought a war across hundreds of millions of light-years, as they labored to build a tunnel out of the universe, as stars flared and died billions of years ahead of their time — humans, squabbling their way across their one Galaxy, were an irritant.
A persistent irritant, though.
Chapter 56
The seven surviving greenships of Exultant Squadron formed up into a tight huddle. In the sudden calm, the crews gazed around at the extraordinary place they had come to.
Of all the Galaxy’s hundreds of billions of stars, SO-2 was the one nearest the black hole. And now they were within its orbit. This central place, a cavity within a cavity light-weeks across, was free of stars — because any star that came closer than SO-2 would be torn apart by black hole tides. It was filled with light and matter, though, with glowing plasma, but Pirius’s Virtual filters blocked that out. It was as if the seven of them hovered within a great shell walled by crowded stars, like flies inside a Conurbation dome.
And at the very center of this immense space was a pool of light. From this distance it was like a glowing toy, small enough to cover with a thumbnail held at arm’s length. It was a floor of curdled and glowing gas, as wide as planetary orbits in Sol system. This was the black hole’s accretion disc, the penultimate destination of debris infalling from the rest of the Galaxy — the place where doomed matter was compressed and smashed together, whirling around the hole like water around a leak in a bucket, before it fell into the black hole.
Of the monstrous black hole itself Pirius could see only a pinpoint spark, an innocent light like a young sun, set in the center of the disc. Somewhere in there was an event horizon that would have engulfed ten Sols side by side; indeed, in Sol system it would have stretched to the orbit of the innermost planet, Mercury. The glow was the final cry of matter, compressed and heated as it fell into the hole, the flaw in the universe into which the Galaxy was steadily draining.
And it was Pirius’s target.
Cabel was studying magnified images of the accretion disc. He found a bright arc, traced across the churning surface of the disc, glowing brightly. “What’s that?”
“I think it’s a star,” Bilson said. “A star that came too close. Lethe, there is still fusion going on there.”
Cabel said slowly, “A star, being torn to pieces. Lethe, what a place we’ve come to.”
Blue called, “Heads up. Take a look at your tactical displays.”
Pirius Red’s Virtual maps of the region lit up with virulent crimson sparks, the locations of Xeelee concentrations. Most of them were around the rim of the accretion disc itself.
Blue reported, “The good news is that I don’t see any nightfighters or other combat ships in this region — none within the orbit of SO-2. So the feint with the grav shield worked. The Xeelee really didn’t anticipate we would get this far, and their reactions are slow. We have some time. But those red points in the accretion disc are Xeelee emplacements, Sugar Lumps, probably used as flak batteries. They are static — they aren’t going to come after us — but they pack a punch.”
So, Pirius thought, studying his display, to get at the black hole his greenships were going to have to fly through a hail of Xeelee flak, as well as pushing through the hazardous zone of the accretion disc.
“Let’s get it done before they wake up,” he said. “I’ll go in first. Engineer? Navigator? Are you with me?”
“Ready, Pilot,” Bilson said, his voice tight with tension.
Cabel called, “It’s what we came here to do.”
“Prep the weapons.”
Pirius worked through his checklist quickly, trying to set aside his own doubts, his fear. He knew they only had a few chances to make this work. Each of the ships carried only one pair of black-hole bombs: they would be able to deliver just one blow each. And this first run, with the Xeelee totally unprepared, was their best chance of all. If he succeeded on this very first strike, they could go home. He desperately hoped he could make it happen.