For a scenic view, and an answer-page for Guess The World...
There
was nothing moving in sight on the fairly level plane, spawled off by
Jupiter's fierce heat when the System was young, whose horizon was a
scant mile away. So they started walking. Gravitation was surprisingly
strong, indicating unusual density. This fact, plus the intense cold
which slows down the dance of the atoms, accounted for the fact that
Five still retained remnants of an atmosphere.
The
hikers even saw traces of water vapor, in form of frost. Occasionally
they passed clumps of mossy or lichenous growth. Twice they observed
colonies of slug-like creatures growing, reproducing, and dying with
amazing rapidity...
Arthur K Barnes, Interplanetary Huntress (1956)
…The detailed examination
of the photos would take several hours; after a while the endless repetition of
impact craters, fractured rocks, and occasional patches of frozen gas produced
something close to boredom. But no one
could tear himself away from the screen; and at last, after more than half the
stored images had been scanned, patience was rewarded.
The crucial sequence had been taken
with a telephoto lens, just as Jupiter V was emerging from shadow. At one moment there was a black screen; then,
magically, a thin crescent suddenly materialized, as the little moon came out
of eclipse.
Kimball was the first to spot the
curious oval patch near the terminator.
He froze the picture, and zoomed in for full magnification. As he did so, there were simultaneous gasps
from all his colleagues.
Part of the side facing Jupiter had
been sheared off flat, as if by a cosmic bulldozer, leaving a perfectly
circular plateau several miles across.
At its center was a clear-cut, sharply defined rectangle, about five
times as long as it was wide, and pitch-black.
At first glance it seemed to be a solid object; then they realized that
they were staring into shadow; this was an enormous hole or slot…
Arthur C Clarke, The Lost Worlds of 2001 (1972)
>> Guess The World - Sixth Series