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Updated: May 2, 2025
As the two went outside, the Simonidean asked curtly, "Wine, women or song?" "Why not some of all three?" Hanlon laughed lightly. "Anything you think would be a lively evening, and that you'd enjoy." The other unbent a little. "We'll go to the Phobos first, then. They have good liquor and a nice floor show. Good looking wenches who don't wear too much."
So that Phobos, unlike our moon, was in the beginning farther from its primary than now. But here again Mr. Nolan entered a caveat. Applying the simple test of numerical evaluation, he showed that before solar tidal friction could lengthen the rotation-period of Mars by so much as one minute, Phobos should have been precipitated upon its surface.
It was long gone, when the first atomic bombs and magnetic bombs dropped from Phobos reached the spot, and only hot rock and broken metal remained. Mars Center failed in fact the next time Phobos rode high over it.
Solar tidal friction, although it did not hinder the formation of two minute dependents of Mars, has been invoked to explain the anomalously rapid revolution of one of them. Phobos, we have seen, completes more than three revolutions while Mars rotates once. But this was probably not always so. The two periods were originally nearly equal.
The diameters just mentioned are Professor Pickering's estimates, based on the amount of light the little satellites reflect, for they are much too small to present measurable disks. Deimos is 14,600 miles from the center of Mars and 12,500 miles from its surface. Phobos is 5,800 miles from the center of the planet and only 3,700 from the surface.
Phobos was setting for the first time that night when Dark reached the great hulk of Ultra Vires, manipulated one of the airlocks and entered its dark corridors. There was no light, and a test of the light switch proved that the electrical system was no longer operating. But Dark knew every inch of this place from early childhood.
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.
The larger of the two, Phobos, is believed to be about seven miles in diameter; the smaller, Deimos, only five or six miles. Their dimensions thus resemble those of the more minute of the asteroids, and the suggestion has even been made that they may be captured asteroids which have fallen under the gravitational control of Mars.
"I daresay we shall," replied Zaidie; "Martian civilisation is crowding towards the Equator, though I should call that place down there the greater New York of Mars, and see there's Brooklyn just across the canal. I wonder what they're thinking about us down there." Phobos revolves from west to east almost along the plane of its primary's equator.
And during this time Phobos is rushing through the sky in the opposite direction, as if in defiance of the fundamental law of celestial revolution, making a complete circuit three times every twenty-four hours, and changing the shape of its disk four times as rapidly as Deimos does!
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