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Towards its centre it showed great intensity of light, becoming visible in the crepusculum before stars of the second magnitude. Through its more attenuated extremity, the stars were plainly seen, the coma seeming to be much less dense, showing the sky through the centre like a dark line.
"The theory of the air seemeth at present," he says, "to be perfectly well understood, and the differing densities thereof at all altitudes; for supposing the same air to occupy spaces reciprocally proportional to the quantity of the superior or incumbent air, I have elsewhere proved that at forty miles high the air is rarer than at the surface of the earth at three thousand times; and that the utmost height of the atmosphere, which reflects light in the Crepusculum, is not fully forty-five miles, notwithstanding which 'tis still manifest that some sort of vapors, and those in no small quantity, arise nearly to that height.
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