asteroid in 2304 - how ironic that a land impact would have done much less damage! - had reminded
all future generations that the human race had too many eggs in one fragile basket.
Well, Chandler told himself, it would be fifty years before this particular package reached
its destination, so a delay of a week would hardly make much difference. But all the calculations
about rotation, centre of mass, and thrust vectors would have to be redone, and radioed back to
Mars for checking. It was a good idea to do your sums carefully, before nudging billions of tons
of ice along an orbit that might take it within hailing distance of Earth.
As they had done so many times before, Captain Chandler's eyes strayed towards the ancient
photograph above his desk. It showed a three-masted steamship, dwarfed by the iceberg that was
looming above it - as, indeed, Goliath was dwarfed at this very moment.
How incredible, he had often thought, that only one long lifetime spanned the gulf between
this primitive Discovery and the ship that had carried the same name to Jupiter! And what would
those Antarctic explorers of a thousand years ago have made of the view from his bridge? They
would certainly have been disoriented, for the wall of ice beside which Goliath was floating
stretched both upwards and downwards as far as the eye could see. And it was strange-looking ice,
wholly lacking the immaculate whites and blues of the frozen Polar seas. In fact, it looked dirty -
as indeed it was. For only some ninety per cent was water-ice: the rest was a witch's brew of
carbon and sulphur compounds, most of them stable only at temperatures not far above absolute
zero. Thawing them out could produce unpleasant surprises: as one astrochemist had famously
remarked, 'Comets have bad breath'.
'Skipper to all personnel,' Chandler announced. 'There's been a slight change of programme.
We've been asked to delay operations, to investigate a target that Spaceguard radar has picked
up.'
'Any details?' somebody asked, when the chorus of groans over the ship's intercom had died
away.
'Not many, but I gather it's another Millennium Committee project they've forgotten to
cancel.'
More groans: everyone had become heartily sick of all the events planned to celebrate the end
of the 2000s. There had been a general sigh of relief when 1 January 3001 had passed uneventfully,
and the human race could resume its normal activities.
'Anyway, it will probably be another false alarm, like the last one. We'll get back to work
just as quickly as we can. Skipper out.'
This was the third wild-goose-chase, Chandler thought morosely, he'd been involved with during
his career. Despite centuries of exploration, the Solar System could still produce surprises, and
presumably Spaceguard had a good reason for its request. He only hoped that some imaginative idiot
hadn't once again sighted the fabled Golden Asteroid. If it did exist - which Chandler did not for
a moment believe - it would be no more than a mineralogical curiosity: it would be of far less
real value than the ice he was nudging sunwards, to bring life to barren worlds.
There was one possibility, however, which he did take quite seriously. Already, the human race
had scattered its robot probes through a volume of space a hundred light-years across - and the
Tycho Monolith was sufficient reminder that much older civilizations had engaged in similar
activities. There might well be other alien artefacts in the Solar System, or in transit through
it. Captain Chandler suspected that Spaceguard had something like this in mind: otherwise it would
hardly have diverted a Class I space-tug to go chasing after an unidentified radar blip.
Five hours later, the questing Goliath detected the echo at extreme range; even allowing for
the distance, it seemed disappointingly small. However, as it grew clearer and stronger, it began
to give the signature of a metallic object, perhaps a couple of metres long. It was travelling on
an orbit heading out of the Solar System, so was almost certainly, Chandler decided, one of the
myriad pieces of space-junk that Mankind had tossed towards the stars during the last millennium
and which might one day provide the only evidence that the human race had ever existed.
Then it came close enough for visual inspection, and Captain Chandler realized, with awed
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