The sun is a large world of much more size and weight than the earth and all the stars that move round it. It is by its great weight that it draws them all to it, and if they did not move fast and far in a course that takes them from the sun, all those stars that move round it with our world would be drawn to it in a short time. No one knows of what the sun is made, nor how it is that it gives so much heat and light; but most wise men think that it is a world like our own, where men can live, and not be burnt more than we are burnt by the heat of the earth. What makes the light and heat is a thing that seems strange to all. Some think that the clouds round it give out the light; that the black spots which are seen on the sun are large holes in the clouds round it, through which the sun is seen, and that the black spots are parts of the real sun. The sun shines and gives out heat to all the stars, which could not move in their orbs if the sun did not draw them to it; for they would else fly off through space.