
On the subject of his engines, Money Izolo waxed loquacious. “Deutrelium burns clean, sir—only
charged particles are produced, so we can steer them out the back with electric fields. Meaning there’s
no radiation hazard to the crew, in theory. But there’s impurities, yah? Teeny little bits of the ship that get
mixed in with the fuel slurry. These cause side reactions, releasing stuff like high-energy neutrinos, which
convert some fraction of the electrons in the exhaust plasma into pions, which are harder to stop. That’s a
problem, a danger, that never goes away. I could use a whole person full-time, just monitoring the pion
flux.”
Conrad smirked. “A true pioneer, eh?”
But Money missed the pun and just looked at him blankly for a moment before continuing. “When we’re
nonpropulsive, the demands on the reactor will be a lot less, and a lot steadier. Lighting, heating, life
support . . . Those are predictable loads. Still, data processing can take a lot of power when the
hypercomputers get large enough. Working on a tough problem they can fill this whole wall, with the heat
sinks glowing red from dissipated information, which is the same thing as heat. And we expend about one
hundred watts continuously on waste management, mostly dust.”
Conrad’s eyebrow went up. “Dust?”
“Yah, there are mechanical parts on this ship: fans, bearings, hinges, and seals. Stuff like that. It’s all
subject to mechanical wear. And the stuff that rubs off winds up mostly in the atmosphere, as a
nanoparticle smog which settles out on surfaces. And to the extent that we have people onboard, out of
fax storage, there are always shed skin cells, and hair, and what have you. People shed an incredible
amount of mass over the course of a month. Almost half a kilogram per person, which is more than the
weight of your hand. Yah, I know, it’s disgusting.
“Anyways, the wellstone bucket-brigades that stuff to the nearest fax machine for disposal, but it takes a
certain amount of energy and computing to do that, see? And inside the fax there’s a sorting penalty.
We’re fighting entropy itself. To turn a kilogram of dust into a kilogram of buffer mass sorted by atomic
number, you need as much energy as you’d get from burning a thousand birthday candles. On a planet,
that process happens naturally, powered by sunlight, and the fact that it’s wickedly inefficient doesn’t
matter. But here it’s a part of our daily maintenance. Like holding back the tide with a mop.”
“I thought entropy always increased.”
“It does, yah. All you can do is push it off somewheres else. With enough energy, you can reduce it
locally, but there’s a larger increase in the rest of the universe. It has to be that way, right? Or else life
and machinery wouldn’t be possible at all. But entropy is the great bill collector; it always catches up,
oozing around every barrier. It’ll find us in the end.”
“How comforting.”
“Isn’t it? And then there’s the occasional juking maneuver—we’ll be in Sol’s Oort cloud for another
thirty years, and later on we’ll be in Barnard’s for ten. Juking takes energy, and requires a minimum
reactor temperature. But yah, I think most of that can be handled automatically.”
Conrad ran his hand along the wall, feeling the flat, smooth texture of the wellstone. He tried to imagine
the electrical potentials in there, dancing as oversized pseudoatoms flexed their orbital “arms” to pass a
dust grain along. “That’s interesting about the sorting penalty,” he said. “I’ve never heard anything like
that before.”
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