Paskoe frowned through his visor, studying the line of the ridge with an
engineer's practiced eye.
"Well, what do you think?" Fields inquired into his radio. "See any
problems?"
"Uh uh." Paskoe's reply was slow and noncommittal as he squinted against
the glare of the setting sun. He turned to stare back at the metallic glint
that marked the position of the base at the foot of the low hills on the
skyline behind them, then returned his gaze to the ridge to register mentally
a couple of salient boulders near its crest. "No...no problems," he said at
last. "I think I've seen all I need. Let's get back to the truck and get the
job scheduled. We can't do any more here until the computers have figured out
how they're going to handle it."
The mass-driver at Maskelyne, over a thousand miles away on the western
edge of Tranquillatis, had been in operation for almost a decade. It had been
built as part of the EXPLORER (Exploitation of Lunar ORE Reserves) Project to
hurl lunar rock up into orbit for metal extraction and construction of the
huge space colonies being assembled within several hundred thousand miles of
Earth. In fact the title was something of a deliberate misnomer. There were of
course no true ores on the Moon -- ores in the sense of metal-rich substances
concentrated by weathering and geological processes. Deep below the surface,
however, were rich accumulations of titanium, aluminum, iron and suchlike that
had been precipitated by thermofluidic processes operative during the Moon's
early history. The compounds bearing these elements had been dubbed "ores" by
the media and the name had stuck.
The mass-driver was a five-mile-long, ruler-straight track flanked by
two "hedges" of continuous electromagnetic windings -- an immense linear
accelerator stretching westward across Tranquillatis. It accelerated
supercooled magnetic "buckets" riding on cushions of flux at 100g to reach
escape velocity in the first two miles. Beyond that the buckets were laser-
tracked and computer-adjusted to eject their loads of moonrock in a shallow
climb that just cleared the mountains two hundred miles away by virtue of the
Moon's surface curvature. En route the loads were electrically charged by
being sprayed with electrons and fine-trimmed by massive electrostatic
deflectors located at the two-hundred-mile downrange point to leave the final
phase of launch with an accuracy better than one part in a million --
comparable to a football being kicked between the uprights from 3,000 miles.
From there on each load, comprising 60 pounds of "ore," climbed steadily
for two days until, 40,000 miles above the lunar surface, it fell into a
"Hippo" catcher-ship stationed at the gravitationally stable L2 point. The
energy needed to power the mass-driver was beamed down as microwaves from a
three-mile-wide orbiting solar collector.
Day in, day out, round the clock, the mass-driver sent up a charge every
two seconds, halting only for maintenance or for occasional repairs. Every
year, one million tons of moonrock fell into the waiting relays of Hippos. And
farther out in space, the colonies steadily took shape.
The project had been so successful that the powers-that-be had decided
to go ahead with the construction of a second mass-driver. This one would also
be located on the equator, but near Reinhold, aiming out across Procellarum.
The track, the experts had decreed, would pass right over the point at which
Fields and Paskoe were standing. Not a little to the right nor a little to the
left, they had pronounced after extensive surveys, but right there.
First-phase preparation would require accurate sighting with lasers,
covering a stretch of terrain that extended from a mile or more behind them to
several times that distance ahead, which would require an unobstructed path.
The ridge was not really large -- about the size of a dozen average houses set
end to end -- but...it was in the way.
And so it came about that the form that had stood valiantly to preserve