There was more, though. Between the messages themselves, Trident had identified brief, orderly, unencrypted sequences. Everything was guesswork to a degree, but with such a huge slab of data statistical measures were powerful indicators. Part of the data looked like routing information, addresses for the messages as they were carried through the network. Another part looked like information about the nodes’ current and future trajectories. If Trident really had cracked that, they could work out where to position its successor. In fact, if they placed the successor close enough to the bulge, they could probably keep that one observatory constantly inside the spill from the beam.
Jasim couldn’t resist playing devil’s advocate. “You know, this could just be one part of whatever throws the probes back in our faces, talking to another part. The Aloof themselves could still be dead, while their security system keeps humming with paranoid gossip.”
Leila said blithely, “Hypothesize away. I’m not taking the bait.”
She turned to embrace him, and they kissed. She said, “I’ve forgotten how to celebrate. What happens now?”
He moved his fingertips gently along her arm. Leila opened up the scape, creating a fourth spatial dimension. She took his hand, kissed it, and placed it against her beating heart. Their bodies reconfigured, nerve endings crowding every surface, inside and out.
Jasim climbed inside her, and she inside him, the topology of the scape changing to wrap them together in a mutual embrace. Everything vanished from their lives but pleasure, triumph and each other’s presence, as close as it could ever be.
7
“Are you here for the Listening Party?”
The chitinous heptapod, who’d been wandering the crowded street with a food cart dispensing largesse at random, offered Leila a plate of snacks tailored to her and Jasim’s preferences. She accepted it, then paused to let Tassef, the planet they’d just set foot on, brief her as to the meaning of this phrase. People, Tassef explained, had traveled to this world from throughout the region in order to witness a special event. Some fifteen thousand years before, a burst of data from the Aloof’s network had been picked up by a nearby observatory. In isolation, these bursts meant very little; however, the locals were hopeful that at least one of several proposed observatories near Massa, on the opposite side of the bulge, would have seen spillage including many of the same data packets, forty thousand years before. If any such observations had in fact taken place, news of their precise contents should now, finally, be about to reach Tassef by the longer, disk-based routes of the Amalgam’s own network. Once the two observations could be compared, it would become clear which messages from the earlier Eavesdropping session had made their way to the part of the Aloof’s network that could be sampled from Tassef. The comparison would advance the project of mapping all the symbolic addresses seen in the data onto actual physical locations.
Leila said, “That’s not why we came, but now we know, we’re even more pleased to be here.”
The heptapod emitted a chirp that Leila understood as a gracious welcome, then pushed its way back into the throng.
Jasim said, “Remember when you told me that everyone would get bored with the Aloof while we were still in transit?”
“I said that would happen eventually. If not this trip, the next one.”
“Yes, but you said it five journeys ago.”
Leila scowled, preparing to correct him, but then she checked and he was right.
They hadn’t expected Tassef to be so crowded when they’d chosen it as their destination, some ten thousand years before. The planet had given them a small room in this city, Shalouf, and imposed a thousand-year limit on their presence if they wished to remain embodied without adopting local citizenship. More than a billion visitors had arrived over the last fifty years, anticipating the news of the observations from Massa, but unable to predict the precise time it would reach Tassef because the details of the observatories’ trajectories had still been in transit.
She confessed, “I never thought a billion people would arrange their travel plans around this jigsaw puzzle.”
“Travel plans?” Jasim laughed. “We chose to have our own deaths revolve around the very same thing.”
“Yes, but we’re just weird.”
Jasim gestured at the crowded street. “I don’t think we can compete on that score.”
They wandered through the city, drinking in the decades-long-carnival atmosphere. There were people of every phenotype Leila had encountered before, and more: bipeds, quadrupeds, hexapods, heptapods, walking, shuffling, crawling, scuttling, or soaring high above the street on feathered, scaled or membranous wings. Some were encased in their preferred atmospheres; others, like Leila and Jasim, had chosen instead to be embodied in ersatz flesh that didn’t follow every ancestral chemical dictate. Physics and geometry tied evolution’s hands, and many attempts to solve the same problems had converged on similar answers, but the galaxy’s different replicators still managed their idiosyncratic twists. When Leila let her translator sample the cacophony of voices and signals at random, she felt as if the whole disk, the whole Amalgam, had converged on this tiny metropolis.
In fact, most of the travelers had come just a few hundred light-years to be here. She and Jasim had chosen to keep their role in the history of Eavesdropping out of their precis, and Leila caught herself with a rather smug sense of walking among the crowd like some unacknowledged sage, bemused by the late-blooming, and no doubt superficial, interest of the masses. On reflection, though, any sense of superior knowledge was hard to justify, when most of these people would have grown up steeped in developments that she was only belatedly catching up with. A new generation of observatories had been designed while she and Jasim were in transit, based on “strong bullets”: specially designed femtomachines, clusters of protons and neutrons stable only for trillionths of a second, launched at ultra-relativistic speeds so great that time dilation enabled them to survive long enough to collide with other components and merge into tiny, short-lived gamma-ray observatories. The basic trick that had built Trident had gone from a one-off gamble into a miniaturized, mass-produced phenomenon, with literally billions of strong bullets being fired continuously from thousands of planets around the inner disk.
Femtomachines themselves were old hat, but it had taken the technical challenges of Eavesdropping to motivate someone into squeezing a few more tricks out of them. Historians had always understood that in the long run, technological progress was a horizontal asymptote: once people had more or less everything they wanted that was physically possible, every incremental change would take exponentially longer to achieve, with diminishing returns and ever less reason to bother. The Amalgam would probably spend an eon inching its way closer to the flatline, but this was proof that shifts of circumstance alone could still trigger a modest renaissance or two, without the need for any radical scientific discovery or even a genuinely new technology.
They stopped to rest in a square, beside a small fountain gushing aromatic hydrocarbons. The Tassef locals, quadrupeds with slick, rubbery hides, played in the sticky black spray then licked each other clean.
Jasim shaded his eyes from the sun. He said, “We’ve had our autumn child, and we’ve seen its grandchildren prosper. I’m not sure what’s left.”
“No.” Leila was in no rush to die, but they’d sampled fifty thousand years of their discovery’s consequences. They’d followed in the wake of the news of the gamma ray signals as it circled the inner disk, spending less than a century conscious as they sped from world to world. At first they’d been hunting for some vital new role to play, but they’d slowly come to accept that the avalanche they’d triggered had out-raced them. Physical and logical maps of the Aloof’s network were being constructed, as fast as the laws of physics allowed. Billions of people on thousands of planets, scattered around the inner rim of the Amalgam’s territory, were sharing their observations to help piece together the living skeleton of their elusive neighbors. When that project was complete it would not be the end of anything, but it could mark the start of a long hiatus. The encrypted, classical data would never yield anything more than traffic routes; no amount of ingenuity could extract its content. The quantum keys that could unlock it, assuming the Aloof even used such things, would be absolutely immune to theft, duplication, or surreptitious sampling. One day, there would be another breakthrough, and everything would change again, but did they want to wait a hundred thousand years, a million, just to see what came next?