Greg Egan - Incandescence

«Are you a child of DNA?»

Rakesh was affronted; if he'd considered this to be information that any stranger wandering by had a right to know, it would have been included in his précis. After a moment's reflection, though, his indignation gave way to curiosity. The stranger was either being deliberately offensive, or had a very good reason for asking. Either way, this was the most interesting thing that had happened to him all day.

«Why do you wish to know?» he replied. The stranger's own précis contained extensive details of its ancestry and sensory modalities, but Rakesh wasn't in the mood to acquire the necessary skills to apprehend it on its own terms. By default, he was already perceiving it as human-shaped, and hearing it speak in his own native tongue. Now, in place of its declared chemosensory label, he assigned it a simple phonetic name chosen at random: Lahl.

Before Lahl could reply, Viya had risen to her feet beside Rakesh and gestured toward an empty spot on the annular bench that surrounded their table. «Please join us,» she said.

Lahl nodded graciously. «Thank you.» Lahl's actual gender didn't map on to Rakesh's language neatly, but the arbitrary name he'd given her was grammatically female. She sat between the other two members of the group, Parantham and Csi, facing Rakesh squarely. Behind her in the distance, water cascaded down a jagged rocky slope, sending a mist of fine droplets raining down on to the forest below.

«I couldn't help overhearing your complaint,» Lahl said. «'Everything has been done. Everything has been discovered.'» To Rakesh, they were seated in the open air, near the edge of a mesa that rose above the treetops of a vast jungle. The murmur of multilingual conversation from the tables around them might have been the sound of insects, if it had not been for the occasional translated phrase that Rakesh allowed himself to hear at random, in case anything piqued his interest. Perhaps to Lahl his words had come across as a distinctive aroma, standing out from a jumble of background odors.

Csi spread his hands in a gesture of apology to this stranger unfamiliar with their customs. «That's just Rakesh's way of talking,» he confided. «You should pay him no attention. We get the same speech every day.»

«Which makes it no less true,» Rakesh protested. «Our ancestors have sucked the Milky Way dry. We were born too late; there's nothing left for us.»

«Only several billion other galaxies,» Parantham observed mildly. She smiled; her position on this subject had barely shifted since Rakesh had met her, but for her it was still a worthwhile debate, not the empty ritual it had become for Csi.

«Containing what?» Rakesh countered. «Probably more or less the same kinds of worlds and civilizations as our own. Probably nothing that would not be a hideous anticlimax, after traveling such a distance.» A few thousand intrepid fools had, in fact, set out for Andromeda, with no guarantee that the spore packages they'd sent in advance would survive the two-million-light-year journey and construct receivers for them.

Rakesh turned to Lahl. «I'm sorry, we keep interrupting you. But what exactly does my molecular ancestry have to do with this?»

«I could be mistaken,» Lahl said, «but it might have some bearing on whether or not I can offer you a cure for your malaise.»

Rakesh hesitated, then took the bait. «I do come from DNA,» he said. «But I warn you, I think that's a strange way to pigeonhole people.» His human ancestors had fashioned descendants in their own image — who in turn were largely content to do the same — but membership of the broader DNA panspermia implied no particular cultural traits. Entirely different replicators had given rise to creatures more similar to humans, in temperament and values, than any of their molecular cousins.

Lahl said, «I don't mean to judge you by your ancestry, but in my experience even molecular kinship can sometimes lead to a sense of affinity that would otherwise be lacking. The DNA panspermia has been extensively studied; every world it reached was thought to have been identified long ago. Adding the first new entry to that catalog in almost a million years might well hold more interest for you than it does for me.»

Rakesh smiled uncertainly. This was not exactly the kind of momentous discovery that people had made in the Age of Exploration, but in his blackest hours he had often imagined contributing far less to the sum of knowledge than this modest footnote.

It was a pity he'd been beaten to it. «If you've found such a world,» he said, «then you're the one who has extended the list.»

Lahl shook her head. «Strictly speaking, the crucial evidence was obtained by a third party, but that's not the point. We can quibble all day about the formal attributions, but at present only a fragment of the story is known. Almost everything about this world remains to be discovered, and until someone is willing to pursue the matter vigorously, the few scraps of information I'm carrying will mean very little.»

Viya said, «So you're here to trade what you do know?»

«Trade?» Lahl appeared startled. «No. I'm merely hoping to find someone who can do justice to this, since I don't have the time or inclination myself.»

Rakesh was beginning to feel as if he was being prodded awake from a stupefying dream that had gone on so long he'd stopped believing that it could ever end. He'd come to this node, this crossroads, in the hope of encountering exactly this kind of traveler, but in ninety-six years he'd learned nothing from the people passing through that he could not have heard on his home world. He'd made friends among the other node-dawdlers, and they passed the time together pleasantly enough, but his old, naive fantasy of colliding with a stranger bearing a surfeit of mysteries — a weary explorer announcing, «I've seen enough for one lifetime, but here, take this crumb from my pocket» — had been buried long ago.

Now that it was being resurrected before his eyes, he felt more wary than excited. He addressed Lahl respectfully, but chose his words with care. «I can't promise you anything, but if you have the time to tell us what you've learned, I'd be honored.»

Lahl explained that she belonged to a synchronization clan. Its members roamed the galaxy, traveling alone, but had agreed to remain in contact by meeting regularly at prearranged locations, and doing their best to experience similar periods of subjective time between these reunions. She was on her way to the next such event, in a planetary system twelve hundred light years outward from this node. Given that the meetings took place just once every hundred millennia, travel plans could be made well in advance, and there was no excuse for tardiness.

However, for reasons she did not wish to detail, when the time had come to begin the journey Lahl had found herself on the wrong side of the galaxy, with no prospect of fulfilling her appointment by any conventional means. The communications network run by the Amalgam skirted the crowded sphere of stars that formed a bulge at the center of the galactic disk, adding several thousand lightyears to the journey compared to the straight-line distance. So she had weighed her options, and her sense of obligation, and placed her fate in the hands of the Aloof.

Viya gazed at her wonderingly. «You've been through their network?»

«Yes.»

«You would have been encrypted, though?»

«That's the usual practice,» Lahl said. «But I came at a bad time. There'd been an unexpected surge in traffic a few decades before, and there were no encryption keys available for my destination. Keys have to be distributed the long way around; shortages can take centuries to fill. So I had no choice. I traveled in plain sight.»