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About 10 A. M., the sky had a most singular, and I must add a most awful appearance, presenting to the view a vast arch of rolling blackness, which seemed to gather strength and density as it approached the zenith. All at once the clouds began to work round in circles, as if chasing one another through the air.
"Well, what do you think of this, my fine fellow?" asked Debray of the sergeant-at-arms, slipping a louis into his hand. "There will be extenuating circumstances," he replied. Expiation. Notwithstanding the density of the crowd, M. de Villefort saw it open before him.
Physicists who question the existence of such high solar temperature should bear in mind that in consequence of the great attraction of the solar mass, hydrogen on the sun's surface raised to a temperature of 4,000° C. will be nearly twice as heavy as hydrogen on the surface of the earth at ordinary atmospheric temperatures; and that, owing to the immense depth of the solar atmosphere, its density would be so enormous at the stated low temperature that the observed rapid movements within the solar envelope could not possibly take place.
The remainder of the investment is in rotational moment of momentum, the collective amount of which is to be estimated by multiplying the angular velocity of each planet into its density, and the fifth power of its radius if the planet be regarded as homogeneous, or into such other power as may be necessary when the planet is not homogeneous.
The air was too rarefied to permit breathing outside, though my little air compressors were automatically maintaining the proper density within the shell. If I could compress a sufficiently large quantity of air inside the craft, I would add to its weight. But there seemed little chance that I would myself be able to withstand sufficient compression.
The mean density of Venus is about nine tenths of that of the earth, and the force of gravity upon its surface is in the ratio of about 85 to 100 as compared to its force on the surface of the earth. A man removed to Venus would, consequently, find himself perceptibly lighter than he was at home, and would be able to exert his strength with considerably greater effect than on his own planet.
To compute the thrust stresses, I had to know the density of the contents of Cargo Hold One. And here it is: 1.726 gm/cm³. Nothing else that I know of has that exact density." Wallingford pursed his lips. "Dear me," he said after a moment. "I keep forgetting you're too bright for your own good." Then a slow smile spread over his face. "Would you really like to know?"
He sought to ascribe this symptom to the density of the pervasive fog without, that impenetrably cloaked all the world; one might wonder how a man could find his way through the opaque white vapor. It was, however, an accustomed medium to the young mountaineer, and his feet, too, had something of that unclassified muscular instinct, apart from reason, which guides in an oft-trodden path.
Then it contracted further, and perhaps you can guess what the remainder of it is the sun; and by spinning in a plastic state the sun, like the earth, has become a globe, round and comparatively smooth; and its density is now too great to allow of its losing any more fragments, so, as far as we can see, the solar system is complete.
From our description of the two kinds of dynamic co-ordination of positive and negative density at the two ends of the spectrum it follows that the spatial conditions prevailing at one end must be quite different from those at the other. To see this by way of actual perception is indeed not difficult.
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