For a scenic browse, and an answer-page for Guess The World...
...We did not see it die, out there in the freezing fire; it was beyond the reach of our instruments now, and none of them recorded its end. Yet every one of us knew when that moment came, and that is why we are not interested when those who have seen only the films and tapes tell us that we were watching some purely natural phenomenon.#
How can one explain what we felt, in that last moment when half our little world was enmeshed in the dissolving tendrils of that huge but immaterial brain? I can only say that it was a soundless cry of anguish, a death pang that seeped into our minds without passing through the gateways of the senses. Not one of us doubted then, or has ever doubted since, that he had witnessed the passing of a giant.
We may have been both the first and the last of all men to see so mighty a fall...
Arthur C Clarke, Out of the Sun (Worlds of If, February 1958)
...There was no way back to the partial security of the lake basin. The overhang cut him off from that. The futility of trying to hide was apparent, but nevertheless he wormed in among some crimson ferns. The city was at his left. To the right, the fertile plain washed out into a badland of lava and shattered rock, which narrowed and vanished around a shoulder of purple basalt. This defile was still in deep shadow.
The riders were still far away. He saw them splash across a ford, toy figures making little bursts of spray.
The watcher above the trees darted suddenly downward. The quarry was breaking cover...
Leigh Brackett, Shannach - The Last (Planet Stories, November 1952)
...Swinnerton wondered how much of the animal life had survived. Watching and wandering, they saw. Insects buzzed about, amazingly large ones, the size of some birds. Birds, in turn, were all bigger than eagles, snapping up the huge insects as Earth birds snap up gnats. Mammals were winged. Flying wolflike creatures lumbered by, seeking prey in the universal rule of life.
One great bearlike creature, with a membranous wing spread of thirty feet, hovered over them as though contemplating attack. Then it flapped away grotesquely. It pounced on a turkey-sized bird, rended it with its claws, and savagely gobbled it down - all in mid-air...
It was strange and pathetic. These monsters represented the last of a planet's evolution...
Gordon A Giles, Via Mercury (Thrilling Wonder Stories, October 1940)
...For a while, he did not associate the green luminosity with any idea of limitation; for he seemed to be floating in a vast abyss. Then, suddenly, he perceived his error. Putting out his hands, he touched on either side the wall of a narrow vault, and saw that its roof was only a few feet above him. The floor lay at an equal distance beneath; and he himself, without visible support, was reclining in mid-air. The green light, streaming mysteriously from all sides of the vault, had given him the illusion of unbounded space.
Abruptly, at his feet, the end of the vault seemed to disappear in a white glory like pure sunlight. Long, sinuous, six-fingered hands reached out from the glory, grasped him about the ankles, and drew him gently from the green-lit space in which he floated. Weight seemed to return to him as his limbs and body entered the dazzling whiteness; and a moment later, he found himself standing erect in a large chamber, lined with some sort of pale, shimmering metal. Beside him, a strange, unearthly being was closing the panel-like door through which he had been drawn from the emerald-litten vault; and beyond this being, there were two others of the same type...
of them was about the height of a tall man, and the physical
conformation was vaguely similar to that of mankind, but was marked by
an almost god-like beauty and grace of contour... In place of hair, the
full, intellectual heads were crowned with a mass of heavy flesh-like
filaments, hued with changing iridescence, and tossing and curling with a
weird, restless life, like the serpent locks of Medusa...
...I considered running for cover among the small crags and boulders that jutted like house-sized teeth up through the lava. But to run might be to draw attention to myself.
Finally, with utmost caution, I advanced.
On a clear area of plain beside the trail, I came upon a group of about a dozen barrel-sized, bulbous vegetables, ridged like cacti. They had twiggy tufts the size of chop-sticks growing from their tops; the rattling sound came from these sticks tap-tapping.
I ventured closer still. I'd never learn what's what if I avoided every off-putting thing. I stopped at three yards and watched the twigs make their noise. My tension eased as I came to the conclusion that the rattling was purely defensive, evolved to ward off predators. So, having had my look, I returned to the trail. For a while I still heard the click-click-click behind me.
my imagination the noise began to seem like an exchange of remarks, and
the sick eerie hunch that those blind isolated things might be talking made this world seem infinitely lonelier...
Lucky ran forward eagerly in the steady stride which he could maintain for hours without feeling unduly tired. Under the circumstances, he felt he could have maintained such a stride even under Earth’s gravity.
And then, with no warning, no premonitory glow in the sky, no hint of any atmosphere, there was the Sun!
Rather, there was a hairline that was the Sun. It was an unbearable line of light edging a notch of broken rock on the horizon, as though some celestial painter had outlined the gray stone in brilliant white...
Isaac Asimov, Lucky Starr and the Big Sun of Mercury (1956)
stared about him in amazement. The narrow dimlit way was jammed with
revelers. The women wore the historic costume, a short skirt low on
bare hips and a diminutive jacket with squared sleeves. Their black
hair was done up on top of their heads with blossoms of the red egalet
that only blooms during the Rains. Wooden clogs were fastened to their
feet. The men wore gaudy, loose trousers and cummerbunds of green.
Their chests were bare, and many bands of hammered silver ornamented
Emmett McDowell, The Red Witch of Mercury (Planet Stories, Summer 1945)
"I was born in Nefertem, a small town not far from Trismegistus in the Tropic of Gemini, the temperate zone... My parents raised dragons. Most everyone in Nefertem did..."
told us what they looked like... Komodo dragons crossed with zebras
crossed with otters, with the personality of a drunken grand-dad set in
Catherynne M Valente, Radiance (2015)
...The whirling rotary clouds were at times close over us - green and red vapor masses, hurling rain and wind heavy with sulphur.
The clouds sometimes rifted into great vertical funnels through which the clear daylight of the sky was visible. It brightened the scene, and the bleak, desolate landscape beneath us was at those moments clearly shown as great rippled sheets of metallic plateau, drenched with water - shining coppery, then cast with green - or blinding red when the lightning puffed - or again, a wild, broken area with spires and crags and boulders strewn as though some frenzied Titan had flung them.
we swept over tiny valleys where soil had collected and trees and
verdure had sprung up. The trees bent low in the wind; the rain-sheet
blurred our vision of them as we struggled past...
Ray Cummings, Tama of the Light Country (1965)
Once he woke up to see something that looked like a bad attempt to squeeze a face out of putty stuck against the rocks. It was a naturally ugly head, and the way the creature was wobbling something that might have been its lips made it even uglier. He shuddered, before he saw that it was much too wide to squeeze through. And the picture of the thing in his mind didn't help his next attempt at sleep.
The next time he snapped out of his nap was when one of them suddenly slapped a tail against the earth and charged angrily at the stones. They stood up under the assult, by some miracle, even when it kept repeating it. But the ground shook each time the tail slapped down.
The strange part of it was that any one of them could have come through by turning sideways and flowing through, as they had flowed across the ground behind the tractor. But this seemed to be against the rules, for some reason.
Dick got up and moved around, working off the numbness. At his first movement the creatures drew back out of the way. He noticed that when he moved toward them, they started going around to the side. When he stood still, they moved away. But at any other movement, they tried to come through the rocks toward him. It all fitted the legends he had heard, and it was no easier to believe in person than it had been when it was nothing but an idle story.
He saw Charlie watching him, and went back. "I don't get it," he admitted.
"Why should you?" Charlie asked. "You think of 'em as animals. But they ain't - they're just a bunch of walking plants."
"Yep. Move to the darkside, get themselves some water. Move to the hotside, grow a while. Then wander around in Twilight, giving anyone a hard time..."
Lester del Rey, Battle on Mercury (1953)