SFworld 版 (精华区)
发信人: by (春天的小懒虫), 信区: SFworld
标 题: 2010 (47)
发信站: 哈工大紫丁香 (Wed Oct 6 15:23:36 1999), 转信
47
Final Flyby
Yet on further reflection, after the initial amazement had
worn off, it was hard to see how a spreading black stain on
the face of Jupiter could represent any kind of danger. It was
extraordinary - inexplicable - but not as important as the
critical events now only seven hours in the future. A suc-
cessful burn at perijove was all that mattered; they would
have plenty of time to study mysterious black spots on the
way home.
And to sleep; Floyd had given up all attempts at that.
Though the feeling of danger - at least, of known danger -
was much less than on their first approach to Jupiter, a
mixture of excitement and apprehension kept him wide
awake. The excitement was natural and understandable; the
apprehension had more complex causes. Floyd made it a
rule never to worry about events over which he could have
absolutely no control; any external threat would reveal itself
in due time and be dealt with then. But he could not help
wondering if they had done everything possible to safe-
guard the ships.
Apart from onboard mechanical failures, there were two
main sources of concern. Although the tapes that secured
Leonov and Discovery together had shown no tendency to
slip, their severest test was still to come. Almost equally
critical would be the moment of separation when the smal-
lest of the explosive charges once intended to jolt Big
Brother would be used at uncomfortably close quarters.
And, of course, there was Hal...
He had carried out the deorbiting manoeuvre with ex-
quisite precision. He had run the simulations of the Jupiter
flyby, right down to Discovery's last drop of fuel, without
any comments or objections. And although Chandra, as
agreed, had carefully explained what they were trying to
do, did Hal really understand what was happening?
Floyd had one overriding concern, which in the preced-
ing few days had- become almost an obsession. He could
picture everything going perfectly, the ships halfway
through the final manoeuvre, the enormous disk of Jupiter
filling the sky only a few hundred kilometres below them -
and then Hal electronically clearing his throat and saying:
`Dr Chandra, do you mind if I ask you a question?'
It did not happen exactly that way.
The Great Black Spot, as it had been inevitably christened,
was now being carried out of sight by Jupiter's swift rota-
tion. In a few hours the still-accelerating ships would catch
up with it over the nightside of the planet, but this was the
last chance for a close daylight observation.
It was still growing at an extraordinary speed; in the last
two hours, it had more than doubled its area. Except for the
fact that it retained its blackness as it expanded, it resembled
an inkstain spreading in water. Its boundary - now moving
at near-sonic speed in the Jovian atmosphere - still looked
curiously fuzzy and out of focus; at the very highest power
of the ship's telescope, the reason for this was at last appa-
rent.
Unlike the Great Red Spot, the Great Black Spot was not
a continuous structure; it was built up from myriads of tiny
dots, like a half-tone print viewed through a magnifying
glass. Over most of its area, the dots were so closely spaced
that they were almost touching, but at the rim they became
more and more widely spaced, so that the Spot ended in a
grey penumbra rather than at a sharp frontier.
There must have been almost a million of the mysterious
dots, and they were distinctly elongated - ellipses rather
than circles. Katerina, the least imaginative person aboard,
surprised everybody by saying that it looked as if someone
had taken a sackful of rice, dyed it black, and poured it on
the face of Jupiter.
And now the Sun was dropping down behind the huge,
swiftly narrowing arch of the dayside, as for the second time
Leonov raced into the Jovian night for an appointment with
destiny. In less than thirty minutes the final burn would
commence, and things would start to happen very quickly
indeed.
Floyd wondered if he should have joined Chandra and
Curnow, standing watch on Discovery. But there was
nothing he could do; in an emergency, he would only be in
the way. The cut-off switch was in Curnow's pocket, and
Floyd knew that the younger man's reactions were a good
deal swifter than his own. If Hal showed the slightest sign of
misbehaviour, he could be disconnected in less than a
second, but Floyd felt certain that such extreme measures
would not be necessary. Since he had been allowed to do
things his own way, Chandra had cooperated completely in
setting up the procedures for a manual takeover, should that
unfortunate necessity arise. Floyd was confident that he
could be trusted to carry out his duty - however much he
might regret the need.
Curnow was not quite so sure. He would be happier, he
had told Floyd, if he had multiple redundancy in the form of
a second cut-off switch - for Chandra. Meanwhile there was
nothing that anyone could do but wait and watch the
approaching cloudscape of the nightside, dimly visible by
the reflected light of passing satellites> the glow of photo-
chemical reactions, and frequent titanic lightning flashes
from thunderstorms larger than Earth.
The sun winked out behind them, eclipsed in seconds by
the immense globe they were so swiftly approaching. When
they saw it again, they should be on their way home.
`Twenty minutes to ignition. All systems nominal.'
`Thank you, Hal.'
I wonder if Chandra was being quite truthful, thought
Curnow, when he said that Hal would be confused if any-
one else spoke to him. I've talked to him often enough,
when nobody was around, and he always understood me
perfectly. Still, there's not much time left for friendly con-
versation now, though it would help to reduce the strain.
What's Hal really thinking - if he thinks - about the
mission? All his life, Curnow had shied away from abstract,
philosophical questions: I'm a nuts-and-bolts man, he had
often claimed, though there were not too many of either in a
spaceship. Once, he would have laughed at the idea, but
now he began to wonder: Did Hal sense that he would soon
be abandoned, and if so, would he resent it? Curnow almost
reached for the cut-off switch in his pocket, but checked
himself. He had already done this so often that Chandra
might be getting suspicious.
For the hundredth time, he rehearsed the sequence of
events that were due to take place during the next hour. The
moment that Discovery's fuel was exhausted, they would
close down all but essential systems, and dash back to
Leonov through the connecting tube. That would be de-
coupled, the explosive charges would be fired, the ships
would drift apart-and Leonov's own engines would start to
fire. The separation should take place, if everything went
according to plan, just when they were making their closest
approach to Jupiter; that would take maximum advantage
of the planet's gravitational largesse.
`Fifteen minutes to ignition. All systems nominal.'
`Thank you, Hal.'
`By the way,' said Vasili, from the other ship, `we're
catching up with the Great Black Spot again. Wonder if we
can see anything new.'
I rather hope not, thought Curnow; we've got quite
enough on our hands at the moment. Nevertheless, he gave
a quick glance at the image Vasili was transmitting on the
telescope monitor.
At first he could see nothing except the faintly glimmer-
ing nightside of the planet; then he saw, on the horizon, a
foreshortened circle of deeper darkness. They were rushing
toward it with incredible speed.
Vasili increased the light amplification, and the entire
image brightened magically. At last, the Great Black Spot
resolved itself into its myriad identical elements...
My God, thought Curnow, I just don't believe it!
He heard exclamations of surprise from Leonov: all the
others had shared in the same revelation at the same
moment.
`Dr Chandra,' said Hal, `I detect strong vocal stress pat-
terns. Is there a problem?'
`No, Hal,' Chandra answered quickly. `The mission is
proceeding normally. We've just had rather a surprise -
that's all. What do you make of the image on monitor circuit
16?'
`I see the nightside of Jupiter. There is a circular area,
3,250 kilometres in diameter, which is almost completely
covered with rectangular objects.'
`How many?'
There was the briefest of pauses, before Hal flashed the
number on the video display:
1,355,000 ± 1,000
'And do you recognize them?'
`Yes. They are identical in size and shape to the object you
refer to as Big Brother. Ten minutes to ignition. All systems
nominal.'
Mine aren't, thought Curnow. So the damn thing's gone
down to Jupiter - and multiplied. There was something
simultaneously comic and sinister about a plague of black
monoliths; and to his puzzled surprise, that incredible image
on the monitor screen had a certain weird familiarity.
Of course - that was it! Those myriad identical black
rectangles reminded him of - dominoes. Years ago, he had
seen a videodocumentary showing how a team of slightly
crazy Japanese had patiently stood a million dominoes on
end, so that when the very first one was toppled, all the
others would inevitably follow. They had been arranged in
complex patterns, some underwater, some up and down
little stairways, others along multiple tracks so that they
formed pictures and patterns as they fell. It had taken weeks
to set them up; Curnow remembered now that earthquakes
had several times foiled the enterprise, and the final top-
pling, from first domino to the last, had taken more than an
hour.
`Eight minutes to ignition. All systems nominal. Dr
Chandra - may I make a suggestion?'
`What is it, Hal?'
`This is a very unusual phenomenon. Do you not think I
should abort the countdown, so that you can remain to
study it?'
Aboard Leonov, Floyd started to move quickly toward
the bridge. Tanya and Vasili might be needing him. Not to
mention Chandra and Curnow - what a situation! And
suppose Chandra took Hal's side? If he did - they might both
be right! After all, was this not the very reason they had come
here?
If they stopped the countdown, the ships would loop
around Jupiter and be back at precisely the same spot in
nineteen hours. A nineteen-hour hold would create no
problems; if it was not for that enigmatic warning, he
would have strongly recommended it himself.
But they had very much more than a warning. Below
them was a planetary plague spreading across the face of
Jupiter. Perhaps they were indeed running away from the
most extraordinary phenomenon in the history of science.
Even so, he preferred to study it from a safer distance.
`Six minutes to ignition,' said Hal. `All systems nominal.
I am ready to stop the countdown if you agree. Let me
remind you that my prime directive is to study everything
in Jupiter space that may be connected with intelligence.'
Floyd recognized that phrase all too well: he had written it
himself. He wished he could delete it from Hal's memory.
A moment later, he had reached the bridge and joined the
Orlovs. They both looked at him with alarmed concern.
`What do you recommend?' asked Tanya swiftly.
`It's up to Chandra, I'm afraid. Can I speak to him - on
the private line?'
Vasili handed over the microphone.
`Chandra? I assume that Hal can't hear this?'
`Correct, Dr Floyd.'
`You've got to talk quickly- Persuade him that the count-
down must continue, that we appreciate his - er, scientific
enthusiasm - ah, that's the right angle - say we're confident
that he can do the job without our help. And we'll be in
touch with him all the time, of course.'
`Five minutes to ignition. All systems nominal. I am still
waiting for your answer, Dr Chandra.'
So are we all, thought Curnow, only a metre away from
the scientist. And if I do have to push that button at last, it
will be something of a relief. In fact, I'll rather enjoy it.
`Very well, Hal. Continue the countdown. I have every
confidence in your ability to study all phenomena in Jupiter
space, without our supervision. Of course, we will be in
touch with you at all times.'
`Four minutes to ignition. All systems nominal. Propel-
lant-tank pressurization completed. Voltage steady on plas-
ma trigger. Are you sure you are making the right decision,
Dr Chandra? I enjoy working with human beings and have
a stimulating relationship with them. Ship's attitude correct
to point one milliradian.'
`We enjoy working with you, Hal. And we will still be
doing so, even if we are millions of kilometres away.'
`Three minutes to ignition. All systems nominal. Radia-
tion shielding checked. There is a problem of the time lag,
Dr Chandra. It may be necessary to consult each other
without any delay.'
This is insane, Curnow thought, his hand now never far
from the cut-off switch. I really believe that Hal is - lonely.
Is he mimicking some part of Chandra's personality that we
never suspected?
The lights flickered, so imperceptibly that only someone
familiar with every nuance of Discovery's behaviour would
have noticed. It could be good news or bad - the plasma
firing sequence starting, or being terminated.
He risked a quick glance at Chandra; the little scientist's
face was drawn and haggard, and for almost the first time
Curnow felt real sympathy for him as another human
being. And he remembered the startling information that
Floyd had confided in him-Chandra's offer to stay with the
ship, and keep Hal company on the three-year voyage
home. He had heard no more of the idea, and presumably it
had been quietly forgotten after the warning. But perhaps
Chandra was being tempted again; if he was, there was
nothing that he could do about it at that stage. There would
be no time to make the necessary preparations, even if they
stayed on for another orbit and delayed their departure
beyond the deadline. Which Tanya would certainly not
permit after all that had now happened.
`Hal,' whispered Chandra, so quietly that Curnow could
scarcely hear him. `We have to leave. I don't have time to
give you all the reasons, but I can assure you it's true.'
`Two minutes to ignition. All systems nominal. Final
sequence started. I am sorry that you are unable to stay. Can
you give me some of the reasons, in order of importance?'
`Not in two minutes, Hal. Proceed with the countdown. I
will explain everything later. We still have more than an
hour... together.'
Hal did not answer. The silence stretched on and on.
Surely the one-minute announcement was overdue...
Curnow glanced at the clock. My God, he thought, Hal's
missed it! Has he stopped the countdown?
Curnow's hand fumbled uncertainly for the switch. What
do I do now? I wish Floyd would say something, dammit,
but he's probably afraid of making things worse...
I'll wait until time zero - no, it's not that critical, let's say
an extra minute - then I'll zap him and we'll go over to
manual...
From far, far away there came a faint, whistling scream,
like the sound of a tornado marching just below the edge of
the horizon. Discovery started to vibrate; there was the first
intimation of returning gravity.
`Ignition,' said Hal. `Full thrust at T plus fifteen seconds.'
`Thank you, Hal,' replied Chandra.
--
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