Lvov"s isolation closed in. She was alone, the only human on the surface of Pluto.A reply from the Inner System came within twelve hours of the crash. A GUTship was being sent from Jupiter. It would take thirteen days to refit the ship, followed by an eight-day flight to Pluto, then more delay in taking on fresh reaction ma.s.s at Charon. Lvov chafed at the timescale, restless.
There was other mail: concerned notes from Lvov"s family, a testy demand for updates from her research supervisor, and for Cobh, orders from her employer to mark as much of the flitter wreck as she could for salvage and a.n.a.lysis. Cobh"s ship was a commercial wormhole transit vessel, hired by Oxford-Lvov"s university-for this trip. Now, it seemed, a complex battle over liability would be joined between Oxford, Cobh"s firm, and the insurance companies.
Lvov, five light-hours from home, found it difficult to respond to the mail asynchronously. She felt as if she had been cut out of the online mind of humanity. In the end, she drafted replies to her family and deleted the rest of the messages.
She checked her research equipment again, but it really was unuseable. She tried to sleep. The suit was uncomfortable, claustrophobic. She was restless, bored, a little scared.
She began a systematic survey of the surface, taking her scooter on widening spiral sweeps around the crash scar.
The landscape was surprisingly complex, a starlit sculpture of feathery ridges and fine ravines. She kept a few hundred feet above the surface; whenever she flew too low, her heat evoked billowing vapor from fragile nitrogen ice, obliterating ancient features, and she experienced obscure guilt.
She found more of the snowflakelike features, generally in little cl.u.s.ters of eight or ten.
Pluto, like its moon-twin Charon, was a ball of rock clad by thick mantles of water ice and nitrogen ice, and laced with methane, ammonia, and organic compounds. It was like a big, stable comet nucleus; it barely deserved the status of "planet." There were moons bigger than Pluto.
There had been only a handful of visitors in the eighty years since the building of the Poole wormhole.
None of them had troubled to walk the surfaces of Pluto or Charon. The wormhole, Lvov realized, hadn"t been built as a commercial proposition, but as a sort of stunt: the link which connected, at last, all of the System"s planets to the rapid-transit hub at Jupiter.
She tired of her plodding survey. She made sure she could locate the crash scar, lifted the scooter to a mile above the surface, and flew toward the south polar cap.
Cobh called from the Interface. "I think I"m figuring out what happened here-that superluminal effect I talked about. Lvov, have you heard of an Alcubierre wave?" She dumped images to Lvov"s desk-portraits of the wormhole Interface, graphics.
"No." Lvov ignored the input and concentrated on flying the scooter. "Cobh, why should a wormhole become unstable? Hundreds of wormhole rapid transits are made every day, all across the System."
"A wormhole is a flaw in s.p.a.ce. It"s inherently unstable anyway. The throat and mouths are kept open by active feedback loops involving threads of exotic matter. That"s matter with a negative energy density, a sort of antigravity which-"
"But this wormhole went wrong."
"Maybe the tuning wasn"t perfect. The presence of the flitter"s ma.s.s in the throat was enough to send the wormhole over the edge. If the wormhole had been more heavily used, the instability might have been detected earlier, and fixed...."Over the gray-white pole, Lvov flew through banks of aerosol mist; Cobh"s voice whispered to her, remote, without meaning.
Sunrise on Pluto: Sol was a point of light, low on Lvov"s unfolding horizon, wreathed in the complex strata of a cirrus cloud. The Sun was a thousand times fainter than from Earth, but brighter than any planet in Earth"s sky.
The Inner System was a puddle of light around Sol, an oblique disc small enough for Lvov to cover with the palm of her hand. It was a disc that contained almost all of man"s hundreds of billions. Sol brought no heat to her raised hand, but she saw faint shadows, cast by the sun on her faceplate.
The nitrogen atmosphere was dynamic. At perihelion-the closest approach to Sol which Pluto was nearing-the air expanded, to three planetary diameters. Methane and other volatiles joined the thickening air, sublimating from the planet"s surface. Then, when Pluto turned away from Sol and sailed into its two-hundred-year winter, the air snowed down.
Lvov wished she had her atmospheric a.n.a.lysis equipment now; she felt its lack like an ache.
She pa.s.sed over spectacular features: Buie Crater, Tombaugh Plateau, the Lowell Range. She recorded them all, walked on them.
After a while, her world, of Earth and information and work, seemed remote, a glittering abstraction.
Pluto was like a complex, blind fish, drifting around its two-century orbit, gradually interfacing with her.
Changing her, she suspected.
Ten hours after leaving the crash scar, Lvov arrived at the sub-Charon point, called Christy. She kept the scooter hovering, puffs of gas holding her against Pluto"s gentle gravity. Sol was halfway up the sky, a diamond of light. Charon hung directly over Lvov"s head, a misty blue disc, six times the size of Luna as seen from Earth. Half the moon"s lit hemisphere was turned away from Lvov, toward Sol.
Like Luna, Charon was tidally locked to its parent, and kept the same face to Pluto as it orbited. But, unlike Earth, Pluto was also locked to its twin. Every six days the worlds turned about each other, facing each other constantly, like two waltzers. Pluto-Charon was the only significant system in which both partners were tidally locked.
Charon"s surface looked pocked. Lvov had her faceplate enhance the image. Many of the gouges were deep and quite regular.
She remarked on this to Cobh, at the Interface.
"The Poole people mostly used Charon material for the building of the wormhole," Cobh said. "Charon is just rock and water ice. It"s easier to get to water ice, in particular. Charon doesn"t have the inconvenience of an atmosphere, or an overlay of nitrogen ice over the water. And the gravity"s shallower."
The wormhole builders had flown out here in a huge, unreliable GUTship. They had lifted ice and rock off Charon, and used it to construct tetrahedra of exotic matter. The tetrahedra had served as Interfaces, the termini of a wormhole. One Interface had been left in orbit around Pluto, and the other had been hauled laboriously back to Jupiter by the GUTship, itself replenished with Charon ice reaction ma.s.s.
By such crude means, Michael Poole and his people had opened up the Solar System.
"They made Lethe"s own mess of Charon," Lvov said.She could almost see Cobh"s characteristic shrug. So what?
Pluto"s surface was geologically complex, here at this point of maximal tidal stress. She flew over ravines and ridges; in places, it looked as if the land had been smashed up with an immense hammer, cracked and fractured. She imagined there was a greater mix, here, of interior material with the surface ice.
In many places she saw gatherings of the peculiar snowflakes she had noticed before. Perhaps they were some form of frosting effect, she wondered. She descended, thinking vaguely of collecting samples.
She killed the scooter"s jets some yards above the surface, and let the little craft fall under Pluto"s gentle gravity. She hit the ice with a soft collision, but without heat-damaging the surface features much beyond a few feet.
She stepped off the scooter. The ice crunched, and she felt layers compress under her, but the fractured surface supported her weight. She looked up toward Charon. The crimson moon was immense, round, heavy.
She caught a glimmer of light, an arc, directly above her.
It was gone immediately. She closed her eyes and tried to recapture it. A line, slowly curving, like a thread. A web. Suspended between Pluto and Charon.
She looked again, with her faceplate set to optimal enhancement. She couldn"t recapture the vision.
She didn"t say anything to Cobh.
"I was right, by the way," Cobh was saying.
"What?" Lvov tried to focus.
"The wormhole instability, when we crashed. It did cause an Alcubierre wave."
"What"s an Alcubierre wave?"
"The Interface"s negative energy region expanded from the tetrahedron, just for a moment. The negative energy distorted a chunk of s.p.a.cetime. The chunk containing the flitter, and us."
On one side of the flitter, Cobh said, s.p.a.cetime had contracted. Like a model black hole. On the other side, it expanded-like a rerun of the Big Bang, the expansion at the beginning of the Universe.
"An Alcubierre wave is a front in s.p.a.cetime. The Interface-with us embedded inside-was carried along. We were pushed away from the expanding region, and toward the contraction."
"Like a surfer, on a wave."
"Right." Cobh sounded excited. "The effect"s been known to theory, almost since the formulation of relativity. But I don"t think anyone"s observed it before."
"How lucky for us," Lvov said drily. "You said we traveled faster than light. But that"s impossible."
"You can"t move faster than light within s.p.a.cetime. Wormholes are one way of getting around this; in a wormhole you are pa.s.sing through a branch in s.p.a.cetime. The Alcubierre effect is another way. The superluminal velocity comes from the distortion of s.p.a.ce itself; we were carried along within distorting s.p.a.ce."So we weren"t breaking lightspeed within our raft of s.p.a.cetime. But that s.p.a.cetime itself was distorting at more than lightspeed."
"It sounds like cheating."
"So sue me. Or look up the math."
"Couldn"t we use your Alcubierre effect to drive starships?"
"No. The instabilities and the energy drain are forbidding."
One of the snowflake patterns lay mostly undamaged, within Lvov"s reach. She crouched and peered at it. The flake was perhaps a foot across. Internal structure was visible within the clear ice as layers of tubes and compartments; it was highly symmetrical, and very complex. She said to Cobh, "This is an impressive crystallization effect. If that"s what it is." Gingerly, she reached out with thumb and forefinger, and snapped a short tube off the rim of the flake. She laid the sample on her desk. After a few seconds the a.n.a.lysis presented. "It"s mostly water ice, with some contaminants," she told Cobh. "But in a novel molecular form. Denser than normal ice, a kind of gla.s.s. Water would freeze like this under high pressures-several thousand atmospheres."
"Perhaps it"s material from the interior, brought out by the chthonic mixing in that region."
"Perhaps." Lvov felt more confident now; she was intrigued. "Cobh, there"s a larger specimen a few feet farther away."
"Take it easy, Lvov."
She stepped forward. "I"ll be fine. I-"
The surface shattered.
Lvov"s left foot dropped forward, into a shallow hole; something crackled under the sole of her boot.
Threads of ice crystals, oddly woven together, spun up and tracked precise parabolae around her leg.
The fall seemed to take an age; the ice tipped up toward her like an opening door. She put her hands out.
Sloe couldn"t stop the fall, but she was able to cushion herself, and she kept her faceplate away from the ice. She finished up on her backside; she felt the chill of Pluto ice through the suit material over her b.u.t.tocks and calves.
"...Lvov? Are you OK?"
She was panting, she found. "I"m fine."
"You were screaming."
"Was I? I"m sorry. I fell."
"You fell? How?"
"There was a hole, in the ice." She ma.s.saged her left ankle; it didn"t seem to be hurt. "It was covered up."
"Show me."
She got to her feet, stepped gingerly back to the open hole, and held up her data desk. The hole was only a few inches deep. "It was covered by a sort of lid, I think.""Move the desk closer to the hole." Light from the desk, controlled by Cobh, played over the shallow pit.
Lvov found a piece of the smashed lid. It was mostly ice, but there was a texture to its undersurface, embedded thread which bound the ice together.
"Lvov," Cobh said. "Take a look at this."
Lvov lifted the desk aside and peered into the hole. The walls were quite smooth. At the base there was a cl.u.s.ter of spheres, fist-sized. Lvov counted seven; all but one of the spheres had been smashed by her stumble. She picked up the one intact sphere, and turned it over in her hand. It was pearlgray, almost translucent. There was something embedded inside, disc-shaped, complex.
Cobh sounded breathless. "Are you thinking what I"m thinking?"
"It"s an egg," Lvov said. She looked around wildly, at the open pit, the egg, the snowflake patterns.
Suddenly she saw the meaning of the scene; it was as if a light had shone up from within Pluto, illuminating her. The "snowflakes" represented life, she intuited; they had dug the burrows, laid these eggs, and now their bodies of water gla.s.s lay dormant or dead, on the ancient ice....
"I"m coming down," Cobh said sternly. "We"re going to have to discuss this. Don"t say anything to the Inner System; wait until I get back. This could mean trouble for us, Lvov."
Lvov placed the egg back in the shattered nest.
She met Cobh at the crash scar. Cobh was shoveling nitrogen and water ice into the life-support modules" raw material hopper. She hooked up her own and Lvov"s suits to the modules, recharging the suits" internal systems. Then she began to carve GUTdrive components out of the flitter"s hull. The flitter"s central Grand Unified Theory chamber was compact, no larger than a basketball, and the rest of the drive was similarly scaled. "I bet I could get this working," Cobh said. "Although it couldn"t take us anywhere."
Lvov sat on a fragment of the shattered hull. Tentatively, she told Cobh about the web.
Cobh stood with hands on hips, facing Lvov, and Lvov could hear her sucking drink from the nipples in her helmet. "Spiders from Pluto? Give me a break."
"It"s only an a.n.a.logy," Lvov said defensively. "I"m an atmospheric specialist, not a biologist." She tapped the surface of her desk. "It"s not spider web. Obviously. But if that substance has anything like the characteristics of true spider silk, it"s not impossible." She read from her desk. "Spider silk has a breaking strain twice that of steel, but thirty times the elasticity. It"s a type of liquid crystal. It"s used commercially-did you know that?" She fingered the fabric of her suit. "We could be wearing spider silk right now."
"What about the hole with the lid?"
"There are trapdoor spiders in America. On Earth. I remember, when I was a kid... The spiders make burrows, lined with silk, with hinged lids."
"Why make burrows on Pluto?"
"I don"t know. Maybe the eggs can last out the winter that way. Maybe the creatures, the flakes, only have active life during the perihelion period, when the atmosphere expands and enriches." She thought that through. "That fits. That"s why the Poole people didn"t spot anything. The construction team was here close to the last aphelion. Pluto"s year is so long that we"re still only half-way to the next perihelion-""So how do they live?" Cobh snapped. "What do they eat?"
"There must be more to the ecosystem than one species," Lvov conceded. "The flakes-the spiders-need water gla.s.s. But there"s little of that on the surface. Maybe there is some biocycle-plants or burrowing animals-which brings ice and gla.s.s to the surface, from the interior."
"That doesn"t make sense. The layer of nitrogen over water ice is too deep."
"Then where do the flakes get their gla.s.s?"
"Don"t ask me," Cobh said. "It"s your dumb hypothesis. And what about the web? What"s the point of that-if it"s real?"
Lvov ground to a halt. "I don"t know," she said lamely. Although Pluto/Charon is the only place in the System where you could build a spider web between worlds.
Cobh toyed with a fitting from the drive. "Have you told anyone about this yet? In the Inner System, I mean."
"No. You said you wanted to talk about that."
"Right." Lvov saw Cobh close her eyes; her face was masked by the glimmer of her faceplate. "Listen.
Here"s what we say. We"ve seen nothing here. Nothing that couldn"t be explained by crystallization effects."
Lvov was baffled. "What are you talking about? What about the eggs? Why would we lie about this?
Besides, we have the desks-records."