Round the Moon - Jules Verne (books to read in your 20s .TXT) 📗

particular knowledge. Barbicane’s and Nicholl’s were always serious, Michel Ardan’s always fanciful. The projectile, its situation and direction, the incidents that might arise, the precautions necessitated by its fall upon the moon, all this afforded inexhaustible material for conjecture.

Whilst breakfasting a question of Michel’s relative to the projectile provoked a rather curious answer from Barbicane, and one worthy of being recorded.

Michel, supposing the bullet to be suddenly stopped whilst still endowed with its formidable initial velocity, wished to know what the consequences would have been.

“But,” answered Barbicane, “I don’t see how the projectile could have been stopped.”

“But let us suppose it,” answered Nicholl.

“It is an impossible supposition,” replied the practical president, “unless the force of impulsion had failed. But in that case its speed would have gradually decreased, and would not have stopped abruptly.”

“Admit that it had struck against some body in space.”

“What body?”

“The enormous meteor we met.”

“Then,” said Nicholl, “the projectile would have been broken into a thousand pieces, and we with it.”

“More than that,” answered Barbicane, “we should have been burnt alive.”

“Burnt!” exclaimed Michel. “I regret it did not happen for us just to see.”

“And you would have seen with a vengeance,” answered Barbicane. “It is now known that heat is only a modification of movement when water is heated⁠—that is to say, when heat is added to it⁠—that means the giving of movement to its particles.”

“That is an ingenious theory!” said Michel.

“And a correct one, my worthy friend, for it explains all the phenomena of caloric. Heat is only molecular movement, a single oscillation of the particles of a body. When the break is put on a train it stops. But what becomes of the movement which animated it? Why do they grease the axles of the wheels? In order to prevent them catching fire from the movement lost by transformation. Do you understand?”

“Admirably,” answered Michel. “For example, when I have been running some time, and am covered with sweat, why am I forced to stop? Simply because my movement has been transformed into heat.”

Barbicane could not help laughing at this répartie of Michel’s. Then resuming his theory⁠—

“Thus,” said he, “in case of a collision, it would have happened to our projectile as it does to the metal cannonball after striking armour-plate; it would fall burning, because its movement had been transformed into heat. In consequence, I affirm that if our bullet had struck against the asteroid, its speed, suddenly annihilated, would have produced heat enough to turn it immediately into vapour.”

“Then,” asked Nicholl, “what would happen if the earth were to be suddenly stopped in her movement of translation?”

“Her temperature would be carried to such a point,” answered Barbicane, “that she would be immediately reduced to vapour.”

“Good,” said Michel; “that means of ending the world would simplify many things.”

“And suppose the earth were to fall upon the sun?” said Nicholl.

“According to calculations,” answered Barbicane, “that would develop a heat equal to that produced by 1,600 globes of coal, equal in volume to the terrestrial globe.”

“A good increase of temperature for the sun,” replied Michel Ardan, “of which the inhabitants of Uranus or Neptune will probably not complain, for they must be dying of cold on their planet.”

“Thus, then, my friends, any movement suddenly stopped produces heat. This theory makes it supposed that the sun is constantly fed by an incessant fall of bodies upon its surface. It has been calculated⁠—”

“Now I shall be crushed,” murmured Michel, “for figures are coming.”

“It has been calculated,” continued Barbicane imperturbably, “that the shock of each asteroid upon the sun must produce heat equal to that of 4,000 masses of coal of equal volume.”

“And what is the heat of the sun?” asked Michel.

“It is equal to that which would be produced by a stratum of coal surrounding the sun to a depth of twenty-seven kilometres.”

“And that heat⁠—”

“Could boil 2,900,000,000 of cubic myriametres of water an hour.” (A myriametre is equal to rather more than 6.2138 miles, or 6 miles 1 furlong 28 poles.)

“And we are not roasted by it?” cried Michel.

“No,” answered Barbicane, “because the terrestrial atmosphere absorbs four-tenths of the solar heat. Besides, the quantity of heat intercepted by the earth is only two thousand millionth of the total.”

“I see that all is for the best,” replied Michel, “and that our atmosphere is a useful invention, for it not only allows us to breathe, but actually prevents us roasting.”

“Yes,” said Nicholl, “but, unfortunately, it will not be the same on the moon.”

“Bah!” said Michel, always confident. “If there are any inhabitants they breathe. If there are no longer any they will surely have left enough oxygen for three people, if only at the bottom of those ravines where it will have accumulated by reason of its weight! Well, we shall not climb the mountains! That is all.”

And Michel, getting up, went to look at the lunar disc, which was shining with intolerable brilliancy.

“Faith!” said he, “it must be hot up there.”

“Without reckoning,” answered Nicholl, “that daylight lasts 360 hours.”

“And by way of compensation night has the same duration,” said Barbicane, “and as heat is restored by radiation, their temperature must be that of planetary space.”

“A fine country truly!” said Nicholl.

“Never mind! I should like to be there already! It will be comical to have the earth for a moon, to see it rise on the horizon, to recognise the configuration of its continents, to say to oneself, ‘There’s America and there’s Europe;’ then to follow it till it is lost in the rays of the sun! By the by, Barbicane, have the Selenites any eclipses?”

“Yes, eclipses of the sun,” answered Barbicane, “when the centres of the three stars are on the same line with the earth in the middle. But they are merely annular eclipses, during which the earth, thrown like a screen across the solar disc, allows the greater part to be seen.”

“Why is there no total eclipse?” asked Nicholl. “Is it because the cone of shade thrown by the earth does not extend beyond the moon?”

“Yes,