Under his eyes ran in all directions luminous furrows, raised at the edges and concave in the centre, some twelve miles, others thirty miles broad. These brilliant trains extended in some places to within 600 miles of Tycho, and seemed to cover, particularly towards the east, the northeast and the north, the half of the southern hemisphere. One of these jets extended as far as the circle of Neander, situated on the 40th meridian. Another by a slight curve furrowed the Sea of Nectar, breaking against the chain of Pyrenees, after a circuit of 800 miles. Others, towards the west, covered the Sea of Clouds and the Sea of Humours with a luminous network. What was the origin of these sparkling rays, which shone on the plains as well as on the reliefs, at whatever height they might be? All started from a common centre, the crater of Tycho. They sprang from him. Herschel attributed their brilliancy to currents of lava congealed by the cold; an opinion, however, which has not been generally adopted. Other astronomers have seen in these inexplicable rays a kind of _moraines_, rows of erratic blocks, which had been thrown up at the period of Tycho's formation. "And why not?" asked Nicholl of Barbicane, who was relating and rejecting these different opinions. "Because the regularity of these luminous lines, and the violence necessary to carry volcanic matter to such distances, is inexplicable." "Eh! by Jove!" replied Michel Ardan, "it seems easy enough to me to explain the origin of these rays." "Indeed?" said Barbicane. "Indeed," continued Michel. "It is enough to say that it is a vast star, similar to that produced by a ball or a stone thrown at a square of glass!" "Well!" replied Barbicane, smiling. "And what hand would be powerful enough to throw a ball to give such a shock as that?" "The hand is not necessary," answered Nicholl, not at all confounded; "and as to the stone, let us suppose it to be a comet." "Ah! those much-abused comets!" exclaimed Barbicane. "My brave Michel, your explanation is not bad; but your comet is useless. The shock which produced that rent must have come from the inside of the star. A violent contraction of the lunar crust, while cooling, might suffice to imprint this gigantic star." "A contraction! something like a lunar stomach-ache," said Michel Ardan. "Besides," added Barbicane, "this opinion is that of an English savant, Nasmyth, and it seems to me to sufficiently explain the radiation of these mountains." "That Nasmyth was no fool!" replied Michel.