6. What can be seen of the Moon through a telescope? Mountains and plains; and a great number of hollows or craters. 7. How high are the mountains? Some are higher than Mont Blanc. 8. What are the craters? They are thought to be most likely the craters of dead volcanoes. 9. What shape are they? Generally more or less round. 10. Are they large or small? Some are small, only a few miles across. Others are very big. 11. How big are the larger ones? Some are even a hundred miles across. 12. Is the surface of the Moon hot, or cold? It is believed to be very cold. 13. In the night, or in the day? In the day as well as in the night; because there is no air to keep in the Sun’s heat, as on the Earth. 14. What other difference would the want of air make? The sky must be black instead of blue, and the stars must be visible in daylight, and the shadows of the mountains must be very black, not gray, like shadows on the Earth. 15. Are things heavy on the Moon? Yes; but not so heavy as on the Earth. Though the Moon pulls, she pulls less strongly than the Earth, because she is so much smaller. CHAPTER VIII. THE SUN BY DAY. If you look at the Sun in our sky before he sets, and then, a little later, at the Moon when she has risen, it might seem that the two are very much of the same size and very much at the same distance. To be sure, the Sun is the brightest; a great deal the brightest. He has such a dazzling face that you cannot look at him steadily. But certainly he does not look larger than the Moon. What do you think the size of the Sun really and truly is? Once upon a time people supposed him to be about as big as he looked. And afterwards they fancied that perhaps he might be even as large as a little country called Greece, a much smaller country than England. But the Sun is bigger than England, bigger than America, bigger than all the oceans of the Earth heaped together; bigger than the Moon, bigger than the whole Earth, bigger than Earth and Moon rolled into one--oh, we are a long way off yet from the truth! The Sun is a round globe in shape, like the Earth and the Moon. But he is ever so much larger. Our Moon, as you know, is about two thousand miles through from side to side. Our Earth is nearly eight thousand miles through. But that enormous globe, the Sun, is--how much do you guess?--is about _eight hundred and fifty thousand miles through_! Can you picture to yourself what this means? Rather hard, is it not! The Earth seems so big to us who live upon its surface, and yet she is so small beside the great Sun!