By this time you know that our world is actually in the sky, just as much as the sun and moon are in the sky. We are in the moon’s sky, and in the sun’s sky, and in the sky of all other planets and all other stars. For our Earth floats in the same boundless sky-depths as all of them, those sky-depths which are usually known by the name of _Space_. So now, when “Space” is spoken of, you will understand. You will know that it means the Sky, in which float all the heavenly bodies. “Only”--you will perhaps say--“the Moon and the Sun are bright; and so are the Stars. But our dull old world is not bright at all.” That is a great mistake, I assure you. Our world is very bright indeed. She shines with an exquisite radiance. Not indeed with such a dazzling glory as the Sun, but quite as brightly as the Moon. Have you ever noticed how the ocean shines, and flashes forth light, when the Sun beats down full upon it? Or, again, have you not been struck with the shining of white clouds in sunlight? More or less the whole surface of our Earth catches and gives forth again the brightness that comes to her from the Sun. If we could travel away from the Earth to a good distance--say, as far as to the Moon--we should see the round Earth like an enormous, brilliant Moon in the sky, only far larger and more beautiful than our Moon ever looks to us. Some parts would be darker, some more shining; but as a whole the Earth would be a splendid sight. Not bright? Yes, indeed; we are living on a very bright world indeed, though we cannot always see her radiance. QUESTIONS. 1. What is Space? By Space we mean Sky--the whole great Sky, in which are all the heavenly bodies. 2. Is our Earth in the Sky? Just as truly as the Sun and Moon are in the Sky. They are in our sky, we are in their sky. 3. Does our Earth float in Air? No; she floats in the Sky: and the air is a part of the Earth. 4. Do people on the other side of the globe walk head downwards? No; they walk as we do, on firm ground, with the Sky over their heads. 5. What is meant by “up” and “down” to us on Earth? On every part of the Earth _up_ is always toward the Sky, and _down_ is always toward the Earth. 6. Give some examples of the way in which all things move earthward. Water always pours downward. A stone flung, or a ball dropped, always reaches the ground. 7. Why do things descend thus? Because of their own weight or heaviness. 8. What causes weight? The pull of the earth. 9. Give two other names for that “pull.” Attraction and Gravitation. 10. Tell me a few things that are pulled earthward. Men, animals, trees, houses, rocks, cities, hills, mountains, lakes, rivers, oceans, air, clouds, etc. 11. What keeps people on the other side of the Earth from dropping off into the sky? They cannot possibly drop off; because the sky there is upward, the same as here. 12. What would “dropping off” really be? It would be rising upward into the sky.