But since the diameter of the
visible surface increases only as the square root of the height, this
appearance became less and less perceptible as I rose higher. It had
taken me twenty minutes to attain the elevation of thirty-five miles;
but my speed was, of course, constantly increasing, very much as the
speed of an object falling to the Earth from a great height increases;
and before ten more minutes had elapsed, I found myself surrounded by
a blackness nearly absolute, except in the direction of the
Sun,--which was still well above the sea--and immediately round the
terrestrial horizon, on which rested a ring of sunlit azure sky,
broken here and there by clouds. In every other direction I seemed to
be looking not merely upon a black or almost black sky, but into close
surrounding darkness. Amid this darkness, however, were visible
innumerable points of light, more or less brilliant--the stars--which
no longer seemed to be spangled over the surface of a distant vault,
but rather scattered immediately about me, nearer or farther to the
instinctive apprehension of the eye as they were brighter or fainter.
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