Of course all the stars, like all the planets, seem to travel each night across the sky. We have explained this already, and you know quite well now that their nightly journey from east to west is only a seeming journey--only caused by our Earth’s spinning from west to east. But even thus the stars are “fixed” as they go; for all move in the same direction and at the same speed. One star does not travel here and another there, in opposite ways. All travel the same way. Each group of stars keeps always its own shape. Each star has its own particular place among other stars. It is as if the whole sky moved round in one piece. The planets behave quite differently. A planet is seen to change its place from day to day, from month to month, _among_ the stars. Now it is in this group, and now it is in that group. Now it goes forward, and now it seems to travel backward; or again it appears to stop, and then starts off anew. These movements of the planets are a mixture of real movements and of seeming movements. They are partly brought about by our Earth’s own journeying. With the stars no such changes are seen. They remain always the same, always fixed in the same groups. These groups are commonly called “_Constellations_.” The Little Bear’s tail-tip never wanders away from the Little Bear’s body. The four chief body-stars of the Great Bear never part company. Orion’s sword never breaks up, and his belt is always made of three stars in a row, and his feet keep ever at the same distance from his head. Therefore the stars are called “fixed.” And yet they are not fixed. So far as we can tell, every single Star in the sky, like every Planet, has its own movement. Stars as well as worlds are on the rush. Although we cannot actually _see_ all to be moving, we may safely say that all do move. It seems to us, indeed, as impossible for the stars to be at rest as it is for the planets to be at rest. You remember why the planets have to be always hastening along their pathways round the Sun. If one of the worlds came to a stop it would at once begin to fall towards the Sun, drawn by the Sun’s great pull; and perhaps it might end by dropping into the crimson fiery sea. And it is much the same with the stars. Just as the Sun and planets all pull or attract one another, so the stars all pull or attract one another. Each star draws all his neighbor-stars and is drawn by them. If there were nothing to meet this perpetual _pull_ of every star for every other star, then all the stars in the universe would surely in time rush together and become one enormous heap of Suns. But there is something to meet and overcome this pull. The stars, too, are in motion. Each radiant Sun, by his own swift rush through the sky, so overcomes the pull of other stars that he can keep apart from them as he journeys.