SFworld 版 (精华区)
发信人: by (春天的小懒虫), 信区: SFworld
标 题: 2010 (8)
发信站: 哈工大紫丁香 (Wed Oct 6 14:29:42 1999), 转信
8
Transit of Jupiter
The image of Jupiter, with its ribbons of white cloud, its
mottled bands of salmon pink, and the Great Red Spot
staring out like a baleful eye, hung steady on the flight-deck
projection screen. It was three-quarters full, but no one was
looking at the illuminated disk; all eyes were focused on the
crescent of darkness at its edge. There, over the nightside of
the planet, the Chinese ship was about to meet its moment
of truth.
This is absurd, thought Floyd. We can't possibly see
anything across forty million kilometres. And it doesn't
matter; the radio will tell us all we want to know.
Tsien had closed down all voice, video, and data circuits
two hours before, as the long-range antennas were with-
drawn into the protective shadow of the heat shield. Only
the omnidirectional beacon was still transmitting, accurate-
ly pinpointing the Chinese ship's position as it plunged
toward that ocean of continent-sized clouds. The shrill beep
... beep ... beep ... was the only sound in Leonov's
control room. Each of those pulses had left Jupiter more
than two minutes earlier; by this time, their source might
already be a cloud of incandescent gas, dispersing in the
Jovian stratosphere.
The signal was fading, becoming noisy. The beeps were
getting distorted; several dropped out completely, then the
sequence returned. A plasma sheath was building up around
Tsien and soon would cut off all communications until the
ship re-emerged. If it ever did.
'Posmotri!' cried Max. 'There it is!'
At first Floyd could see nothing. Then, just off the edge
of the illuminated disk, he made out a tiny star -- gleaming
where no star could possibly be, against the darkened face of
Jupiter.
It appeared quite motionless, though he knew it must be
moving at a hundred kilometres a second. Slowly it grew in
brilliance; and then it was no longer a dimensionless point,
but was becoming elongated. A man-made comet was
streaking across the Jovian night sky, leaving a trail of
incandescence thousands of kilometres in length.
One last badly distorted and curiously drawn-out beep
sounded from the tracking beacon, then only the meaning-
less hiss of Jupiter's own radiation, one of those many
cosmic voices that had nothing to do with Man or his
works.
Tsien was inaudible, but not yet invisible. For they could
see that the tiny elongated spark had indeed moved appre-
ciably away from the sunward face of the planet and would
soon disappear into the nightside. By then, if all had gone
according to plan, Jupiter would have captured the ship,
destroying its unwanted velocity. When it emerged from
behind the giant world, it would be another Jovian satellite.
The spark flickered out. Tsien had rounded the curve of
the planet and was heading over the nightside. There would
be nothing to see, or to hear, until it emerged tram shadow
-- if all went well, in just under an hour. It would be a very
long hour for the Chinese.
To Chief Scientist Vasili Orlov and communications en-
gineer Sasha Kovalev, the hour went extremely quickly.
There was much they could learn from observations of that
little star; its times of appearance and disappearance and,
above all, the Doppler shift of the radio beacon gave vital
information about Tsien's new orbit. Leonov's computers
were already digesting the figures, and spitting out
projected times of re-emergence based on various assump-
tions about rates of deceleration in the Jovian atmosphere.
Vasili switched off the computer display, spun around in
his chair, loosened his seat belt, and addressed the patiently
waiting audience.
'Earliest reappearance is in forty-two minutes. Why don't
you spectators go for a walk, so we can concentrate on
getting all this into good shape? See you in thirty-five
minutes. Shoo! Nu ukhodi!'
Reluctantly, the unwanted bodies left the bridge -- but, to
Vasili's disgust, everyone was back again in little more than
thirty minutes. He was still chiding them for their lack of
faith in his calculations when the familiar beep... beep...
beep... of Tsien's tracking beacon burst from the loud-
speakers.
Vasili looked astonished and mortified, but soon joined in
the spontaneous round of applause; Floyd could not see who
first started the clapping. Rivals though they might be, they
were all astronauts together, as far from home as any men
had ever travelled -- 'Ambassadors for Mankind', in the
noble words of the first UN Space Treaty. Even if they did
not want the Chinese to succeed, neither did they wish them
to meet disaster.
A large element of self-interest was also involved, Floyd
could not help thinking. Now the odds in Leonov's own
favour were significantly improved; Tsien had demons-
trated that the aerobraking manoeuvre was indeed possible.
The data on Jupiter was correct; its atmosphere did not
contain unexpected and perhaps fatal surprises.
'Well!' said Tanya. 'I suppose we should send them a
message of congratulations. But even if we did, they
wouldn't acknowledge it.'
Some of his colleagues were still making fun of Vasili,
who was staring at his computer output in frank disbelief.
'I don't understand it!' he exclaimed. 'They should still be
behind Jupiter! Sasha -- give me a velocity reading on their
beacon!'
Another silent dialogue was held with the computer; then
Vasili gave a long, low whistle.
'Something's wrong. They're in a capture orbit, all right
-- but it won't let them make a rendezvous with Discovery.
The orbit they're on now will take them way beyond Io --
I'll have more accurate data when we've tracked them for
another five minutes.'
'Anyway, they must be in a safe orbit,' said Tanya. 'They
can always make corrections later.'
'Perhaps. But that could cost them days, even if they have
the fuel. Which I doubt.'
'So we may still beat them.'
'Don't be such an optimist. We're still three weeks from
Jupiter. They can make a dozen orbits before we get there,
and choose the most favourable one for a rendezvous.'
'Again -- assuming that they have enough propellant.'
'Of course. And that's something we can only make edu-
cated guesses about.'
All this conversation took place in such rapid and excited
Russian that Floyd was left far behind. When Tanya took
pity on him and explained that Tsien had overshot and was
heading for the outer satellites, his first reaction was: 'Then
they may be in serious trouble. What will you do if they
appeal for help?'
'You must be making a joke. Can you imagine them
doing that? They're much too proud. Anyway, it would be
impossible. We can't change our mission profile, as you
know perfectly well. Even if we had the fuel...'
'You're right, of course; but it might be difficult to ex-
plain that to the ninety-nine per cent of the human race that
doesn't understand orbital mechanics. We should start
thinking about some of the political complications -- it
would look bad for all of us if we can't help. Vasili, will you
give me their final orbit, as soon as you've worked it out?
I'm going down to my cabin to do some homework.'
Floyd's cabin, or rather one-third of a cabin, was still
partly full of stores, many of them stacked in the curtained
bunks that would be occupied by Chandra and Curnow
when they emerged from their long slumbers. He had man-
aged to clear a small working space for his personal effects
and had been promised the luxury of another whole two
cubic metres -- just as soon as someone could be spared to
help with the furniture removing.
Floyd unlocked his little communications console, set the
decryption keys, and called for the information on Tsien
that had been transmitted to him from Washington. He
wondered if his hosts had had any luck in unscrambling it;
the cipher was based on the product of two hundred-digit
prime numbers, and the National Security Agency had
staked its reputation on the claim that the fastest computer
in existence could not crack it before the Big Crunch at the
end of the Universe. It was a claim that could never be
proved -- only disproved.
Once again he stared intently at the excellent photographs
of the Chinese ship, taken when it had revealed its true
colours and was just about to leave Earth orbit. There were
later shots -- not so clear, because by then it had been far
away from the prying cameras -- of the final stage as it
hurtled toward Jupiter. Those were the ones that interested
him most; even more useful were the cutaway drawings and
estimates of performance.
Granted the most optimistic assumptions, it was difficult
to see what the Chinese hoped to do. They must have
burned up at least ninety per cent of their propellant in that
mad dash across the Solar System. Unless it was literally a
suicide mission -- something that could not be ruled out --
only a plan involving hibernation and later rescue made any
sense. And Intelligence did not believe that Chinese
hibernation technology was sufficiently far advanced to
make that a viable option.
But Intelligence was frequently wrong, and even more
often confused by the avalanche of raw facts it had to
evaluate -- the 'noise' in its information circuits. It had done
a remarkable job on Tsien, considering the shortness of
time, but Floyd wished that the material sent to him had
been more carefully filtered. Some of it was obvious junk,
of no possible connection with the mission.
Nevertheless, when you did not know what you were
looking for, it was important to avoid all prejudices and
preconceptions; something that at first sight seemed irrel-
evant, or even nonsensical, might turn out to be a vital clue.
With a sigh, Floyd started once more to skim the five
hundred pages of data, keeping his mind as blankly recep-
tive as possible while diagrams, charts, photographs -- some
so smudgy that they could represent almost anything --
news items, lists of delegates to scientific conferences, titles
of technical publications, and even commercial documents
scrolled swiftly down the high-resolution screen. A very
efficient industrial espionage system had obviously been
extremely busy; who would have thought that so many
Japanese holomemory modules or Swiss gas-flow micro-
controllers or German radiation detectors could have been
traced to a destination in the dried lake bed of Lop Nor -- the
first milepost on their way to Jupiter?
Some of the items must have been included by accident;
they could not possibly relate to the mission. If the Chinese
had placed a secret order for one thousand infrared sensors
through a dummy corporation in Singapore, that was only
the concern of the military; it seemed highly unlikely that
Tsien expected to be chased by heat-seeking missiles. And
this one was really funny -- specialized surveying and pros-
pecting equipment from Glacier Geophysics, Inc., of
Anchorage, Alaska. What lamebrain imagined that a deep-
space expedition would have any need --
The smile froze on Floyd's lips; he felt the skin crawl on
the back of his neck. My God -- they wouldn't dare! But they
had already dared greatly; and now, at last, everything
made sense.
He flashed back to the photos and conjectured plans of the
Chinese ship. Yes, it was just conceivable -- those flutings at
the rear, alongside the drive deflection electrodes, would be
about the right size...
Floyd called the bridge. 'Vasili.' he said, 'have you
worked out their orbit yet?'
'Yes, I have,' the navigator replied, in a curiously sub-
dued voice. Floyd could tell at once that something had
turned up. He took a long shot.
'They're making a rendezvous with Europa, aren't
they?'
There was an explosive gasp of disbelief from the other
end.
'Chyort voz'mi! How did you know?'
'I didn't - I've just guessed it.'
'There can't be any mistake -- I've checked the figures to
six places. The braking manoeuvre worked out exactly as
they intended. They're right on course for Europa -- it
couldn't have happened by chance. They'll be there in
seventeen hours.'
'And go into orbit.'
'Perhaps; it wouldn't take much propellant. But what
would be the point?'
'I'll risk another guess. They'll do a quick survey -- and
then they'll land.'
'You're crazy -- or do you know something we don't?'
'No -- it's just a matter of simple deduction. You're going
to start kicking yourself for missing the obvious.'
'Okay, Sherlock, why should anyone want to land on
Europa? What's there, for heaven's sake?'
Floyd was enjoying his little moment of triumph. Of
course, he might still be completely wrong.
'What's on Europa? Only the most valuable substance in
the Universe.'
He had overdone it; Vasili was no fool, and snatched the
answer from his lips.
'Of course -- water!'
'Exactly. Billions and billions of tons of it. Enough to fill
up the propellant tanks -- go cruising around all the satellites,
and still have plenty left for the rendezvous with Discovery
and the voyage home. I hate to say this, Vasili -- but our
Chinese friends have outsmarted us again.
'Always assuming, of course, that they can get away with
it.'
--
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