Incandescence

probably just a honey pot.”

“I’m not saying that the relationship is symmetrical,” Parantham conceded. “They’ve certainly out- somethinged us. “

“Outwitted?” Rakesh suggested. “Outsmarted? Outmanoeuvred?”

“Out-sphinxed us,” she replied. “We stared into the bulge for a million years, trying to get a reaction, and they just stared back out at us, stony-faced. We did much more than blink; we gave up the game completely. I don’t believe it’s harmed us, though. I don’t believe it’s a loss on our part, or a victory on theirs. It’s just a difference in our natures. We never wanted to keep our nature and our history secret. It’s a game we never wanted to win.”

Rakesh was woken by the next wave of results. He watched the data and images spinning in his skull as he walked down the corridor to the control cabin, where Parantham was already seated.

“It’s alive!” she crowed. “DNA-based, multi-cellular, engineered. but then drifting genetically, running wild for tens of millions of years.”

The probes had found a scum of fungus-like growth clinging to parts of some of the asteroids. These were not just colonies of microbes; the cells showed specialization, and were organized into distinct clusters. Though the anatomy of the clusters included a protective skin, all of the cells were individually tough enough to retain internal liquid water while exposed to vacuum, over a considerable temperature range, with antifreeze compounds and vapor-reducing soluble polymers augmenting the sheer strength of the cell walls. Their genome showed clear evidence of sophisticated engineering, and although they shared a common ancestor with the dead microbes, most of the traits that ensured their survival in their present harsh environment appeared to have been artificially introduced.

The creation of the species couldn’t be dated exactly until mutation rates and generation times had been measured, but on general biochemical grounds it seemed likely that this fungus had been deliberately constructed at about the time the Steelmakers’ world was torn apart.

Rakesh immersed himself in a diagram of metabolic pathways. “It lives on the stellar wind,” he marveled. “That’s its energy source. For raw materials, it’s coping on the asteroids, but there are vestigial enzymes that suggest it might have thrived with a slightly different substrate. So it spread to the asteroids from somewhere else, and adapted to them over time, but the original species was happier in a different environment.”

Parantham said, “You look up into the sky, and a neutron star is coming. There is no transport network to whisk you away to safety, and you can forget about deflecting this planet-killer. What do you do?”

“Build a spaceship.”

“To go where? There are plenty of stars around, but they’re all devoid of companions. A hundred million years ago your ancestors visited another planet, but the space program has grown a little rusty since then.”

Rakesh grimaced. “So I give up on the idea of running, and make a fungus that will outlive me? I know I’ve been spoiled by high-tech immortality, but that doesn’t sound like much consolation to me.”

Parantham said, “Perhaps it’s just the bottom of the food chain. Make a fungus that will outlive you, then a few species that can eat it, and so on. Then give birth to a child that can live on them.”

“Maybe.” Rakesh ran his fingers through his hair. “Live on them where, though? Those old genes I mentioned were for enzymes that relied on elements that most of the asteroids don’t have. If you know that your world is going to be torn apart, and there are no other planets in sight, where exactly do you expect to live, if not on the scrap heap that’s left behind?”

A few hours later they had the answer, from their telescopes rather than from the probes. Near the edge of the belt, an object some six hundred meters across with a highly atypical spectrum had been found orbiting among the rocks. The telescope’s image showed a gray ellipsoid, pitted and corroded, but clearly too regular to be an asteroid itself. Spectroscopy revealed that its surface contained molecular filaments, carbon nanotubes with elaborate chemical modifications that both strengthened them and protected them against the stellar wind. A variety of the vacuum-hardened fungus they’d detected in the asteroids could be seen in the indentations of small impact craters, where the wind couldn’t reach in to scour it off.

“The material is advanced beyond the Steelmakers’ technology,” Rakesh mused, “but it’s not one hundred million years ahead. They must have gone through a long Dark Age before they finally rose up again.” Only to be cut down once more? That wasn’t clear. Their home world was in ruins, but this artefact was in one piece.

Parantham said, “That surface looks as if it hasn’t been repaired in fifty million years.”

“Not everyone cares about surfaces,” Rakesh replied. “There could still be someone home.”

They sent a surveyor probe, which tomographed the artefact with ambient neutrinos. Inside was a maze of tunnels and caves. Apart from these empty spaces, there was an intricate pattern to the density of the structure itself: parts of the walls were solid as basalt, while others seemed as spongy and permeable as limestone.

Parantham beamed a radio signal from the surveyor probe down to the artefact, a simple message of greeting repeated across the frequency spectrum. The faint passive echo that came back suggested some long strips of conducting material, but no resonant circuits: electrical wiring, perhaps, but no obvious low-tech receivers or transmitters.

An analysis of the artefact’s thermal emissions showed no significant amounts of heat being generated within, beyond what might be expected from a small amount of the fungus, and perhaps other species. There was no obvious stream of waste, organic or otherwise, leaving the artefact, though with the stellar wind as its only input any putative ecosystem would have to cling tightly to all of its materials.

Rakesh said, “It’s time to send in the jelly babies.”

“Ha! You were far more cautious with Steel Mountain,” Parantham reminded him.

“If we trigger some elaborate defensive response,” Rakesh said, “then at least I’ll die happy. Knowing that this civilization survived.”

There was no entranceway into the artefact, but the surveyor probe identified a system of narrow cracks in the exterior wall that ultimately led to one of the internal tunnels. If they made their avatars even smaller than before, about a fifth of a millimeter tall, they would be able to squeeze through.

Rakesh glanced up one last time into the sky full of hot blue stars before following Parantham into the chasm.

As the walls twisted around them, they soon reached a point where the stars were hidden and everything was swallowed by the deep shadows of vacuum; by switching to infrared vision, though, it was possible to grope their way down by the thermal glow of their surroundings. Their avatars sported adhesive pads on their hands and feet, tailored to the chemistry of the bare surface, but the infestations of fungus made their grip less secure.

Rakesh sent nanomachines from a stock in his avatar’s arm into a patch of fungus, to sequence it. There were at least nine distinct species present, and they all showed marked differences from the kind found on the asteroids. The vestigial enzymes he’d noted there were being produced in far greater quantities here, and seemed to interact with several components of the wall material. As he pondered the modified diagram of metabolic pathways, he realized what was happening. The walls acted as a reservoir for the raw materials that the fungus needed, but the fungus did more than leech essential nutrients out of its environment. As part of its life cycle, it returned everything it took, with the added bonus that structural flaws in the wall were repaired in the process. The system wasn’t perfect, but a few cracks after fifty million years wasn’t bad.

It was a tortuous business navigating the fissure, but Rakesh wasn’t tempted to disconnect his senses and leave his avatar on autopilot. He didn’t know if he was entering a mouldy tomb or a thriving metropolis, but he had no wish to dilute, or distance himself from, the experience. As painful as he found it to be forced to confront the bleak prospects for life in the bulge, this expedition was exactly what he’d been seeking ever since he’d left his home world. Who else on Shab-e-Noor, who else in the whole disk, would be able to tell their descendants: “We climbed down through a gap in the wall, not knowing what we would find inside the structure after fifty million years?”

When they emerged into the tunnel, Rakesh found himself immersed in a featureless glow. The tunnel wall was so close to being uniform in temperature that its thermal emissions rendered everything in contrast-free monochrome. It was almost impossible to interpret what he saw, let alone navigate by it.

“Is it just me who’s gone blind?” he asked Parantham.