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Updated: September 3, 2025
Deimos, on the other hand, has a period of revolution five or six hours longer than that of the planet's axial rotation, so that it rises, like the other heavenly bodies, in the east; but, because its motion is so nearly equal, in angular velocity, to that of Mars's rotation, it shifts very slowly through the sky toward the west, and for two or three successive days and nights it remains above the horizon, the sun overtaking and passing it again and again, while, in the meantime, its protean face swiftly changes from full circle to half-moon, from half-moon to crescent, from crescent back to half, and from half to full, and so on without ceasing.
Still, of course, it was essential that we, on our part, should keep a close watch, and so a number of sentinels were selected, whose duty it was to place themselves at the edge of Deimos, where they could peep over the horizon, so to speak, and catch sight of the globe of our enemies.
But Mira held Phobos and Deimos. In two weeks, they had set up cannon there, and proved themselves accurate long-range gunners. Against the feeble attraction of Deimos, and with Mars' gravity to help them, they began bombarding the two stations, and anything that attempted to approach them, with gamma and atomic explosive bombs.
Windows there were none, and investigation showed that the small ports were all covered with their pivoted safety plates. He extinguished the light, swung aside one of the plates, and peered out into the Martian night. It was moonlight both Deimos and Phobos were racing across the blue-black sky. The waters of Crystal Canal stretched out before him, seemingly illimitable.
These two moons are very small, the outer one perhaps five or six miles in diameter, and the inner one about seven; therefore from Mars the outer one, Deimos, cannot look much more than a brilliant star, and the inner one would be but a fifth part the apparent width of our own moon. So Mars is not very well off, after all.
Two of the jet boats were jockeyed into position on either side of the chamber and several lengths of cable were stretched between them, forming a cradle for the chamber. Since the jet boats were equipped with foldaway wings, which, when extended, would enable them to fly at slower speed through atmosphere, they hoped to make a glider landing at the Deimos spaceport.
She'd asked no questions and hadn't even tried to convince him that he'd be sent back to Earth now. He muttered to himself as he headed over the rubble toward the previously domed section. Out at the spaceport, ships were dropping down from Deimos with the supplies that had been held up so long, and a long line of trucks went snaking by.
"If Tom is inside, we have to take it down to Deimos. If we open it here, and he doesn't have a space suit on, he'd suffocate." "He'd freeze solid before that," said Kit, not mentioning the possibility that Tom might very well be frozen already, since the ship's heating units had been torn away from the air lock.
They had survived their first twenty-four hours in the barren wastes of the New Sahara, with each boy acutely aware that there was at least a week more of the same in front of them. The sky blackened, and soon after Deimos rose and started climbing across the dark sky. "How much water left?" asked Astro thickly. "Enough for one more drink apiece," Tom replied.
Phobos was emerging from a cloud and its yellow rays possessing a greater illuminating power, mingled suddenly with the blue and spectral beams of Deimos and the land thus visited by the complimentary flood of light from these twin luminaries seemed suddenly dipped in silver. A beautiful white light, most unreal, as you mortals might say, fell on tree and water, cliff, hill, and villages.
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