--"I beg your pardon, Ardan--" said Barbican.
--"Granted, dear boy--granted with the utmost pleasure!" interrupted the Frenchman.
"I shall probably have to direct my observations altogether to you, Captain," continued Barbican; "friend Michael interrupts me so often that I"m afraid he can hardly understand my remarks."
"I always admired your candor, Barbican," said Ardan; "it"s a n.o.ble quality, a grand quality!"
"Don"t mention it," replied Barbican, turning towards M"Nicholl, still in the dark, and addressing him exclusively; "You see, my dear Captain, the period at which the Moon"s invisible side receives at once its light and heat is exactly the period of her _conjunction_, that is to say, when she is lying between the Earth and the Sun. In comparison therefore with the place which she had occupied at her _opposition_, or when her visible side was fully illuminated, she is nearer to the Sun by double her distance from the Earth, or nearly 480 thousand miles. Therefore, my dear Captain, you can see how when the invisible side of the Moon is turned towards the Sun, she is nearly half a million of miles nearer to him than she had been before. Therefore, her heat should be so much the greater."
"I see it at a glance," said the Captain.
"Whereas--" continued Barbican.
"One moment!" cried Ardan.
"Another interruption!" exclaimed Barbican; "What is the meaning of it, Sir?"
"I ask my honorable friend the privilege of the floor for one moment,"
cried Ardan.
"What for?"
"To continue the explanation."
"Why so?"
"To show that I can understand as well as interrupt!"
"You have the floor!" exclaimed Barbican, in a voice no longer showing any traces of ill humor.
"I expected no less from the honorable gentleman"s well known courtesy,"
replied Ardan. Then changing his manner and imitating to the life Barbican"s voice, articulation, and gestures, he continued: "Whereas, you see, my dear Captain, the period at which the Moon"s visible side receives at once its light and heat, is exactly the period of her _opposition_, that is to say, when she is lying on one side of the Earth and the Sun at the other. In comparison therefore with the point which she had occupied in _conjunction_, or when her invisible side was fully illuminated, she is farther from the Sun by double her distance from the Earth, or nearly 480,000 miles. Therefore, my dear Captain, you can readily see how when the Moon"s invisible side is turned _from_ the Sun, she is nearly half a million miles further from him than she had been before. Therefore her heat should be so much the less."
"Well done, friend Ardan!" cried Barbican, clapping his hands with pleasure. "Yes, Captain, he understood it as well as either of us the whole time. Intelligence, not indifference, caused him to interrupt.
Wonderful fellow!"
"That"s the kind of a man I am!" replied Ardan, not without some degree of complacency. Then he added simply: "Barbican, my friend, if I understand your explanations so readily, attribute it all to their astonishing lucidity. If I have any faculity, it is that of being able to scent common sense at the first glimmer. Your sentences are so steeped in it that I catch their full meaning long before you end them--hence my apparent inattention. But we"re not yet done with the visible face of the Moon: it seems to me you have not yet enumerated all the advantages in which it surpa.s.ses the other side."
"Another of these advantages," continued Barbican, "is that it is from the visible side alone that eclipses of the Sun can be seen. This is self-evident, the interposition of the Earth being possible only between this visible face and the Sun. Furthermore, such eclipses of the Sun would be of a far more imposing character than anything of the kind to be witnessed from our Earth. This is chiefly for two reasons: first, when we, terrestrians, see the Sun eclipsed, we notice that, the discs of the two orbs being of about the same apparent size, one cannot hide the other except for a short time; second, as the two bodies are moving in opposite directions, the total duration of the eclipse, even under the most favorable circ.u.mstances, can"t last longer than 7 minutes.
Whereas to a Selenite who sees the Earth eclipse the Sun, not only does the Earth"s disc appear four times larger than the Sun"s, but also, as his day is 14 times longer than ours, the two heavenly bodies must remain several hours in contact. Besides, notwithstanding the apparent superiority of the Earth"s disc, the refracting power of the atmosphere will never allow the Sun to be eclipsed altogether. Even when completely screened by the Earth, he would form a beautiful circle around her of yellow, red, and crimson light, in which she would appear to float like a vast sphere of jet in a glowing sea of gold, rubies, sparkling carbuncles and garnets."
"It seems to me," said M"Nicholl, "that, taking everything into consideration, the invisible side has been rather shabbily treated."
"I know I should not stay there very long," said Ardan; "the desire of seeing such a splendid sight as that eclipse would be enough to bring me to the visible side as soon as possible."
"Yes, I have no doubt of that, friend Michael," pursued Barbican; "but to see the eclipse it would not be necessary to quit the dark hemisphere altogether. You are, of course, aware that in consequence of her librations, or noddings, or wobblings, the Moon presents to the eyes of the Earth a little more than the exact half of her disc. She has two motions, one on her path around the Earth, and the other a shifting around on her own axis by which she endeavors to keep the same side always turned towards our sphere. This she cannot always do, as while one motion, the latter, is strictly uniform, the other being eccentric, sometimes accelerating her and sometimes r.e.t.a.r.ding, she has not time to shift herself around completely and with perfect correspondence of movement. At her perigee, for instance, she moves forward quicker than she can shift, so that we detect a portion of her western border before she has time to conceal it. Similarly, at her apogee, when her rate of motion is comparatively slow, she shifts a little too quickly for her velocity, and therefore cannot help revealing a certain portion of her eastern border. She shows altogether about 8 degrees of the dark side, about 4 at the east and 4 at the west, so that, out of her 360 degrees, about 188, in other words, a little more than 57 per cent., about 4/7 of the entire surface, becomes visible to human eyes. Consequently a Selenite could catch an occasional glimpse of our Earth, without altogether quitting the dark side."
"No matter for that!" cried Ardan; "if we ever become Selenites we must inhabit the visible side. My weak point is light, and that I must have when it can be got."
"Unless, as perhaps in this case, you might be paying too dear for it,"
observed M"Nicholl. "How would you like to pay for your light by the loss of the atmosphere, which, according to some philosophers, is piled away on the dark side?"
"Ah! In that case I should consider a little before committing myself,"
replied Ardan, "I should like to hear your opinion regarding such a notion, Barbican. Hey! Do your hear? Have astronomers any valid reasons for supposing the atmosphere to have fled to the dark side of the Moon?"
"Defer that question till some other time, Ardan," whispered M"Nicholl; "Barbican is just now thinking out something that interests him far more deeply than any empty speculation of astronomers. If you are near the window, look out through it towards the Moon. Can you see anything?"
"I can feel the window with my hand; but for all I can see, I might as well be over head and ears in a hogshead of ink."
The two friends kept up a desultory conversation, but Barbican did not hear them. One fact, in particular, troubled him, and he sought in vain to account for it. Having come so near the Moon--about 30 miles--why had not the Projectile gone all the way? Had its velocity been very great, the tendency to fall could certainly be counteracted. But the velocity being undeniably very moderate, how explain such a decided resistance to Lunar attraction? Had the Projectile come within the sphere of some strange unknown influence? Did the neighborhood of some mysterious body retain it firmly imbedded in ether? That it would never reach the Moon, was now beyond all doubt; but where was it going? Nearer to her or further off? Or was it rushing resistlessly into infinity on the wings of that pitchy night? Who could tell, know, calculate--who could even guess, amid the horror of this gloomy blackness? Questions, like these, left Barbican no rest; in vain he tried to grapple with them; he felt like a child before them, baffled and almost despairing.
In fact, what could be more tantalizing? Just outside their windows, only a few leagues off, perhaps only a few miles, lay the radiant planet of the night, but in every respect as far off from the eyes of himself and his companions as if she was hiding at the other side of Jupiter!
And to their ears she was no nearer. Earthquakes of the old t.i.tanic type might at that very moment be upheaving her surface with resistless force, crashing mountain against mountain as fiercely as wave meets wave around the storm-lashed cliffs of Cape Horn. But not the faintest far off murmur even of such a mighty tumult could break the dead brooding silence that surrounded the travellers. Nay, the Moon, realizing the weird fancy of the Arabian poet, who calls her a "giant stiffening into granite, but struggling madly against his doom," might shriek, in a spasm of agony, loudly enough to be heard in Sirius. But our travellers could not hear it. Their ears no sound could now reach. They could no more detect the rending of a continent than the falling of a feather.
Air, the propagator and transmitter of sound, was absent from her surface. Her cries, her struggles, her groans, were all smothered beneath the impenetrable tomb of eternal silence!
These were some of the fanciful ideas by which Ardan tried to amuse his companions in the present unsatisfactory state of affairs. His efforts, however well meant, were not successful. M"Nicholl"s growls were more savage than usual, and even Barbican"s patience was decidedly giving way. The loss of the other face they could have easily borne--with most of its details they had been already familiar. But, no, it must be the dark face that now escaped their observation! The very one that for numberless reasons they were actually dying to see! They looked out of the windows once more at the black Moon beneath them.
There it lay below them, a round black spot, hiding the sweet faces of the stars, but otherwise no more distinguishable by the travellers than if they were lying in the depths of the Mammoth Cave of Kentucky. And just think. Only fifteen days before, that dark face had been splendidly illuminated by the solar beams, every crater l.u.s.trous, every peak sparkling, every streak glistening under the vertical ray. In fifteen days later, a day light the most brilliant would have replaced a midnight the most Cimmerian. But in fifteen days later, where would the Projectile be? In what direction would it have been drawn by the forces innumerable of attractions incalculable? To such a question as this, even Ardan would reply only by an ominous shake of the head.
We know already that our travellers, as well as astronomers generally, judging from that portion of the dark side occasionally revealed by the Moon"s librations, were _pretty certain_ that there is no great difference between her two sides, as far as regards their physical const.i.tutions. This portion, about the seventh part, shows plains and mountains, circles and craters, all of precisely the same nature as those already laid down on the chart. Judging therefore from a.n.a.logy, the other three-sevenths are, in all probability a world in every respect exactly like the visible face--that is, arid, desert, dead. But our travellers also knew that _pretty certain_ is far from _quite certain_, and that arguing merely from a.n.a.logy may enable you to give a good guess, but can never lead you to an undoubted conclusion. What if the atmosphere had really withdrawn to this dark face? And if air, why not water? Would not this be enough to infuse life into the whole continent? Why should not vegetation flourish on its plains, fish in its seas, animals in its forests, and man in every one of its zones that were capable of sustaining life? To these interesting questions, what a satisfaction it would be to be able to answer positively one way or another! For thousands of difficult problems a mere glimpse at this hemisphere would be enough to furnish a satisfactory reply. How glorious it would be to contemplate a realm on which the eye of man has never yet rested!
Great, therefore, as you may readily conceive, was the depression of our travellers" spirits, as they pursued their way, enveloped in a veil of darkness the most profound. Still even then Ardan, as usual, formed somewhat of an exception. Finding it impossible to see a particle of the Lunar surface, he gave it up for good, and tried to console himself by gazing at the stars, which now fairly blazed in the spangled heavens.
And certainly never before had astronomer enjoyed an opportunity for gazing at the heavenly bodies under such peculiar advantages. How Fraye of Paris, Chacornac of Lyons, and Father Secchi of Rome would have envied him!
For, candidly and truly speaking, never before had mortal eye revelled on such a scene of starry splendor. The black sky sparkled with l.u.s.trous fires, like the ceiling of a vast hall of ebony encrusted with flashing diamonds. Ardan"s eye could take in the whole extent in an easy sweep from the _Southern Cross_ to the _Little Bear_, thus embracing within one glance not only the two polar stars of the present day, but also _Campus_ and _Vega_, which, by reason of the _precession of the Equinoxes_, are to be our polar stars 12,000 years hence. His imagination, as if intoxicated, reeled wildly through these sublime infinitudes and got lost in them. He forgot all about himself and all about his companions. He forgot even the strangeness of the fate that had sent them wandering through these forbidden regions, like a bewildered comet that had lost its way. With what a soft sweet light every star glowed! No matter what its magnitude, the stream that flowed from it looked calm and holy. No twinkling, no scintillation, no nict.i.tation, disturbed their pure and lambent gleam. No atmosphere here interposed its layers of humidity or of unequal density to interrupt the stately majesty of their effulgence. The longer he gazed upon them, the more absorbing became their attraction. He felt that they were great kindly eyes looking down even yet with benevolence and protection on himself and his companions now driving wildly through s.p.a.ce, and lost in the pathless depths of the black ocean of infinity!
He soon became aware that his friends, following his example, had interested themselves in gazing at the stars, and were now just as absorbed as himself in the contemplation of the transcendent spectacle.
For a long time all three continued to feast their eyes on all the glories of the starry firmament; but, strange to say, the part that seemed to possess the strangest and weirdest fascination for their wandering glances was the spot where the vast disc of the Moon showed like an enormous round hole, black and soundless, and apparently deep enough to permit a glance into the darkest mysteries of the infinite.
A disagreeable sensation, however, against which they had been for some time struggling, at last put an end to their contemplations, and compelled them to think of themselves. This was nothing less than a pretty sharp cold, at first somewhat endurable, but which soon covered the inside surface of the window panes with a thick coating of ice. The fact was that, the Sun"s direct rays having no longer an opportunity of warming up the Projectile, the latter began to lose rapidly by radiation whatever heat it had stored away within its walls. The consequence was a very decided falling of the thermometer, and so thick a condensation of the internal moisture on the window gla.s.ses as to soon render all external observations extremely difficult, if not actually impossible.
The Captain, as the oldest man in the party, claimed the privilege of saying he could stand it no longer. Striking a light, he consulted the thermometer and cried out:
"Seventeen degrees below zero, centigrade! that is certainly low enough to make an old fellow like me feel rather chilly!"
"Just one degree and a half above zero, Fahrenheit!" observed Barbican; "I really had no idea that it was so cold."
His teeth actually chattered so much that he could hardly articulate; still he, as well as the others, disliked to entrench on their short supply of gas.
"One feature of our journey that I particularly admire," said Ardan, trying to laugh with freezing lips, "is that we can"t complain of monotony. At one time we are frying with the heat and blinded with the light, like Indians caught on a burning prairie; at another, we are freezing in the pitchy darkness of a hyperborean winter, like Sir John Franklin"s merry men in the Bay of Boothia. _Madame La Nature_, you don"t forget your devotees; on the contrary, you overwhelm us with your attentions!"
"Our external temperature may be reckoned at how much?" asked the Captain, making a desperate effort to keep up the conversation.
"The temperature outside our Projectile must be precisely the same as that of interstellar s.p.a.ce in general," answered Barbican.
"Is not this precisely the moment then," interposed Ardan, quickly, "for making an experiment which we could never have made as long as we were in the sunshine?"
"That"s so!" exclaimed Barbican; "now or never! I"m glad you thought of it, Ardan. We are just now in the position to find out the temperature of s.p.a.ce by actual experiment, and so see whose calculations are right, Fourier"s or Pouillet"s."