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Updated: June 16, 2025
It was just drifting slightly before them. So they had achieved the correct orbital speed. They ion-glided to the chunk, and began to search clumsily for worthwhile metal. It was fantastic that somebody had been there before them, chiselling and sawing out a greyish material, of which there was a little left that made the needles of their radiation counters swing wildly.
Its orbital momentum, however, is so extremely small in proportion to the rotational momentum of Mars, that any perceptible inroad upon the latter is attended by a lavish and ruinous expenditure of the former. It is as if a man owning a single five-pound note were to play for equal stakes with a man possessing a million.
But since during this action the wheel D turns relatively to the pin b, the moon evidently rotates about its axis with an angular velocity precisely equal to that of its orbital motion.
Uranus, for instance, has an orbital velocity of four miles a second, and his gravity is about three-fourths that of the earth.
As he neared the analysis section, it went into deceleration, but the pressure was not too bad. He made his way against it easily. The chief analyst was waiting for him. "We have everything you need, Lieutenant, except the orbital stuff. We'll do the best we can on that and have an estimate in a few minutes. Meanwhile you can mark up your figures.
He was led to this demonstration through considering the orbital motion of the moon. According to the familiar story, which has become one of the classic myths of science, Newton was led to take up the problem through observing the fall of an apple. Voltaire is responsible for the story, which serves as well as another; its truth or falsity need not in the least concern us.
George Darwin of the theory of tidal friction in its application to planetary evolution, for this furnished a satisfactory explanation of the manner in which a body, situated as near the sun as Mercury is, could have its axial rotation gradually reduced by the tidal attraction of the sun until it coincided in period with its orbital revolution.
There was no time for thought after that. Mars' orbital station lay close when the work was finished. Ben slapped Feldman on the back. "Ya ain't bad for a greenie, Dan. We all get six-day passes on Mars. Hit the sack now so you won't waste time sleeping then. We'll hear it when the ship berths." Feldman didn't hear it, but the others did.
There is some question whether or not it is a binary, for, while the twin stars are both moving in the same direction in space with comparative rapidity, yet conclusive evidence of orbital motion is lacking.
The theory continues that such are the laws of matter that these orbital lines must exist in a disc of fire mist such as that out of which our solar universe has been produced.
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