The Year's Best Science Fiction, Vol. 20

“Their preliminary analysis just came in,” Alan said. “As best they can guess-and I’m cutting through a lot of clutter here-the rain you went through wasn’t pure methane.”

“No shit, Sherlock.”

“They’re assuming that whitish deposit you found on the rings and ropes is your culprit. They can’t agree on what it is, but they think it underwent a chemical reaction with the material of your balloon and sealed the rip panel shut.”

“I thought this was supposed to be a pretty nonreaclive environment.”

“It is. But your balloon runs off your suit’s waste heat. The air in it is several degrees above the melting-point of ice. That’s the equivalent of a blast furnace, here on Titan. Enough energy to run any number of amazing reactions. You haven’t stopped tugging on the vent rope?”

“I’m tugging away right now. When one arm gets sore, I switch arms.”

“Good girl. I know how tired you must be.”

“Take a break from the voice-posts,” Consuelo suggested, “and check out the results we’re getting from the robofish. It’s giving us some really interesting stuff.”

So she did. And for a time it distracted her, just as they’d hoped. There was a lot more ethane and propane than their models had predicted, and surprisingly less methane. The mix of fractions was nothing like what she’d expected. She had learned just enough chemistry to guess at some of the implications of the data being generated, but not enough to put it all together. Still tugging at the ropes in the sequence uploaded by the engineers in Toronto, she scrolled up the chart of hydrocarbons dissolved in the lake.

Solute Solute mole fraction

Ethyne 4.0 x 10 -4

Propyne 4.4 x 10 -5

1,3-Butadiyne 7.7 x 10 -7

Carbon Dioxide 0.1 x 10 -5

Methanenitrile 5.7 x 10 -6

But after a while, the experience of working hard and getting nowhere, combined with the tedium of floating farther and farther out over the featureless sea, began to drag on her. The columns of figures grew meaningless, then indistinct.

Propanenitrile 6.0 x 10 -5

Propanenitrile 9.9 x 10 -6

Propynenitrile 5.3 x 10 -6

Hardly noticing she was doing so, she fell asleep.

She was in a lightless building, climbing flight after flight of stairs. There were other people with her, also climbing. They jostled against her as she ran up the stairs, flowing upward, passing her, not talking.

It was getting colder.

She had a distant memory of being in the furnace room down below. It was hot there, swelteringly so. Much cooler where she was now. Almost too cool. With every step she took, it got a little cooler still. She found herself slowing down. Now it was definitely too cold. Unpleasantly so. Her leg muscles ached. The air seemed to be thickening around her as well. She could barely move now.

This was, she realized, the natural consequence of moving away from the furnace. The higher up she got, the less heat there was to be had, and the less energy to be turned into motion. It all made perfect sense to her somehow.

Step. Pause.

Step. Longer pause.

Stop.

The people around her had slowed to a stop as well. A breeze colder than ice touched her, and without surprise, she knew that they had reached the top of the stairs and were standing upon the building’s roof. It was as dark without as it had been within. She stared upward and saw nothing.

“Horizons. Absolutely baffling,” somebody murmured beside her.

“Not once you get used to them.” she replied.

“Up and down-are these hierarchic values?”

“They don’t have to be.”

“Motion. What a delightful concept.”

“We like it.”

“So you are me?”

“No. I mean, I don’t think so.”

“Why?”

She was struggling to find an answer to this, when somebody gasped. High up in the starless, featureless sky, a light bloomed. The crowd around her rustled with unspoken fear. Brighter, the light grew. Brighter still. She could feel heat radiating from it, slight but definite, like the rumor of a distant sun. Everyone about her was frozen with horror. More terrifying than a light where none was possible was the presence of heat. It simply could not be. And yet it was.

She, along with the others, waited and watched for… something. She could not say what. The light shifted slowly in the sky. It was small, intense, ugly.

Then the light screamed.

***

She woke up.

“Wow,” she said. “I just had the weirdest dream.”

“Did you?” Alan said casually.

“Yeah. There was this light in the sky. It was like a nuclear bomb or something. I mean, it didn’t look anything like a nuclear bomb, but it was terrifying the way a nuclear bomb would be. Everybody was staring at it. We couldn’t move. And then…” She shook her head. “I lost it. I’m sorry. It was just so strange. I can’t put it into words.”

“Never mind that,” Consuelo said cheerily. “We’re getting some great readings down below the surface. Fractional polymers, long-chain hydrocarbons… fabulous stuff. You really should try to stay awake to catch some of this.”

She was fully awake now, and not feeling too happy about it. “I guess that means that nobody’s come up with any good ideas yet on how I might get down.”