M. Pouillet was right and Fourier wrong. That was the undoubted temperature of the starry space. Such is, perhaps, that of the lunar continents, when the orb of night has lost by radiation all the heat which fifteen days of sun have poured into her. CHAPTER XV. HYPERBOLA OR PARABOLA. We may, perhaps, be astonished to find Barbicane and his companions so little occupied with the future reserved for them in their metal prison which was bearing them through the infinity of space. Instead of asking where they were going, they passed their time making experiments, as if they had been quietly installed in their own study. We might answer that men so strong-minded were above such anxieties—that they did not trouble themselves about such trifles—and that they had something else to do than to occupy their minds with the future. The truth was that they were not masters of their projectile; they could neither check its course, nor alter its direction. A sailor can change the head of his ship as he pleases; an aeronaut can give a vertical motion to his balloon. They, on the contrary, had no power over their vehicle. Every maneuver was forbidden. Hence the inclination to let things alone, or as the sailors say, "let her run." Where did they find themselves at this moment, at eight o'clock in the morning of the day called upon the earth the 6th of December? Very certainly in the neighbourhood of the moon, and even near enough for her to look to them like an enormous black screen upon the firmament. As to the distance which separated them, it was impossible to estimate it. The projectile, held by some unaccountable force, had been within four miles of grazing the satellite's north pole. Illustration: A DISCUSSION AROSE. But since entering the cone of shadow these last two hours, had the distance increased or diminished? Every point of mark was wanting by which to estimate both the direction and the speed of the projectile. Perhaps it was rapidly leaving the disc, so that it would soon quit the pure shadow. Perhaps, again, on the other hand, it might be nearing it so much that in a short time it might strike some high point on the invisible hemisphere, which would doubtlessly have ended the journey much to the detriment of the travellers. A discussion arose on this subject, and Michel Ardan, always ready with an explanation, gave it as his opinion that the projectile, held by the lunar attraction, would end by falling on the surface of the terrestrial globe like an aërolite. "First of all, my friend," answered Barbicane, "every aërolite does not fall to the earth; it is only a small proportion which do so; and if we had passed into an aërolite, it does not necessarily follow that we should ever reach the surface of the moon." "But how if we get near enough?" replied Michel. "Pure mistake," replied Barbicane. "Have you not seen shooting stars rush through the sky by thousands at certain seasons?" "Yes."