Of the satellites, Lieutenant Procope went on to say that one is rather smaller than our own moon; that another moves round its primary at an interval about equal to the moon's distance from ourselves; but that they all revolve in considerably less time:
the first takes only l day 18 hours 27 minutes; the second takes 3 days 13 hours 14 minutes; the third, 7 days 3 hours 42 minutes;whilst the largest of all takes but 16 days 16 hours 32 minutes.
The most remote revolves round the planet at a distance of 1,192,820 miles.
"They have been enlisted into the service of science,"said Procope. "It is by their movements that the velocity of light has been calculated; and they have been made available for the determination of terrestrial longitudes.""It must be a wonderful sight," said the captain.
"Yes," answered Procope. "I often think Jupiter is like a prodigious clock with four hands.""I only hope that we are not destined to make a fifth hand,"answered Servadac.
Such was the style of the conversation that was day by day reiterated during the whole month of suspense. Whatever topic might be started, it seemed soon to settle down upon the huge orb that was looming upon them with such threatening aspect.
"The more remote that these planets are from the sun," said Procope, "the more venerable and advanced in formation are they found to be.
Neptune, situated 2,746,271,000 miles from the sun, issued from the solar nebulosity, thousands of millions of centuries back.
Uranus, revolving 1,753,851,000 miles from the center of the planetary system, is of an age amounting to many hundred millions of centuries. Jupiter, the colossal planet, gravitating at a distance of 475,693,000 miles, may be reckoned as 70,000,000 centuries old.
Mars has existed for 1,000,000,000 years at a distance of 139,212,000 miles.
The earth, 91,430,000 miles from the sun, quitted his burning bosom 100,000,000 years ago. Venus, revolving now 66,131,000miles away, may be assigned the age of 50,000,000 years at least;and Mercury, nearest of all, and youngest of all, has been revolving at a distance of 35,393,000 miles for the space of 10,000,000 years--the same time as the moon has been evolved from the earth."Servadac listened attentively. He was at a loss what to say;and the only reply he made to the recital of this novel theory was to the effect that, if it were true, he would prefer being captured by Mercury than by Jupiter, for Mercury, being so much the younger, would probably prove the less imperative and self-willed master.
It was on the 1st of September that the comet had crossed the orbit of Jupiter, and on the 1st of October the two bodies were calculated to be at their minimum separation.
No direct shock, however, could be apprehended; the demonstration was sufficiently complete that the orbit of Gallia did not coincide with that of the planet, the orbit of Jupiter being inclined at an angle of 1 degrees 19 mins to the orbit of the earth, with which that of Gallia was, no doubt, coincident.
As the month of September verged towards its close, Jupiter began to wear an aspect that must have excited the admiration of the most ignorant or the most indifferent observer.
Its salient points were illumined with novel and radiant tints, and the solar rays, reflected from its disc, glowed with a mingled softness and intensity upon Gallia, so that Nerina had to pale her beauty.
Who could wonder that Rosette, enthusiast as he was, should be irremovable from his observatory? Who could expect otherwise than that, with the prospect before him of viewing the giant among planets, ten times nearer than any mortal eye had ever done, he should have begrudged every moment that distracted his attention?
Meanwhile, as Jupiter grew large, the sun grew small.
From its increased remoteness the diameter of the sun's disc was diminished to 5 degrees 46 mins.
And what an increased interest began to be associated with the satellites! They were visible to the naked eye!
Was it not a new record in the annals of science?
Although it is acknowledged that they are not ordinarily visible on earth without the aid of a somewhat powerful telescope, it has been asserted that a favored few, endued with extraordinary powers of vision, have been able to identify them with an unassisted eye; but here, at least, in Nina's Hive were many rivals, for everyone could so far distinguish them one from the other as to describe them by their colors.
The first was of a dull white shade; the second was blue; the third was white and brilliant; the fourth was orange, at times approaching to a red.
It was further observed that Jupiter itself was almost void of scintillation.