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Updated: May 24, 2025
When the time that light takes to travel had been ascertained by means of Jupiter's satellites, a still more important problem could be solved that was our own distance from the sun, which before had only been known approximately, and this was calculated to be ninety-two millions seven hundred thousand miles, though sometimes we are a little nearer and sometimes a little further away.
On the contrary, we cannot but be surprised at the multitude of literary and scientific labours that he accomplished in a few years. Bailly's earliest researches on Jupiter's satellites began in 1763. The subject was happily chosen. Studying it in all its generalities, he showed himself both an indefatigable computer, a clear-sighted geometer, and an industrious and able observer.
The fact is, I felt irresistibly impressed with a presentiment of some vast good fortune impending. I can scarcely say why. Perhaps, after all, it was rather a desire than an actual belief; but do you know that Jupiter's silly words, about the bug being of solid gold, had a remarkable effect upon my fancy? And then the series of accidents and coincidences these were so very extraordinary.
A dozen expeditions were sent to Jupiter's poles to watch and measure and study the tremendous auroral displays there, where Jupiter's vast magnetic field sucked in countless quintillions of the flying electrons from the sun, and brought them circling in, in a vast, magnificent display of auroral ionization.
Yonder are all the kings of Europe, the general's flushed with victory, the Jupiter's darting thunderbolts; they have a hundred thousand victorious soldiers, and back of the hundred thousand a million; their cannon stand with yawning mouths, the match is lighted; they grind down under their heels the Imperial guards, and the grand army; they have just crushed Napoleon, and only Cambronne remains, only this earthworm is left to protest.
Once in the olden times the elephant and the rhinoceros disputed as to which was the more important, and which should, therefore, have empire over the other animals. They decided to settle the point by battle in an enclosed field. The day was fixed, and all in readiness, when somebody came and informed them that Jupiter's ape, bearing a caduceus, had been seen in the air.
"Well, Jupiter's moons, Saturn's ring, and the markings on Mars are all invisible to the naked eye. So are the craters in the moon; so we use the big speculum to gather the light, and then look at the spot where all the rays of light come to their narrowest point, with an eye-piece which really is a microscope." "But I don't understand now," said Tom uneasily. "I wish I was not so "
When Several thousand miles above the pole, they diverted part of the power to attracting the nearest moon that was in the plane of Jupiter's equator, and by the time their upward motion had ceased were moving well in its direction.
If, however, at any time they felt oppressed by Jupiter's high barometric pressure, and preferred the terrestrial conditions, they had but to rise till the barometer fell to thirty. Then, if an object of interest recalled them to sea-level, they could keep the Callisto's inside pressure at what they found on the Jovian mountains, by screwing up the windows.
"Since all but the fifth moon," said Cortlandt, "revolve exactly in the plane of Jupiter's equator, any inhabitants that settle there will become accustomed to eclipses, for there must be one of the sun, and also of the moons, at each revolution, or about forty-five hundred in every Jovian year. The reason we have seen none before is, because we are not exactly on the equator."
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