Does it look like a big round ball? Or is it just a sliver of light in the sky? The moon seems to change. But it doesn't really. The moon revolves around the Earth. It takes about four weeks to make the journey, and as it travels round we can only see certain parts of it. Try the simple experiment described inside using an orange, a pencil, and a flashlight, and you'll understand why the moon seems to change.

About the Authors

Franklyn M. Branley was the originator of the Let's-Read-and-Find-Out Science series and the author of close to 150 popular books about scientific topics for young readers of all ages. He was Astronomer Emeritus and former Chairman of the American Museum of Natural History-Hayden Planetarium.

Ed Emberley has written and illustrated over 60 children's books, including the Drawing Book series. He and his wife, Barbara Emberley, have collaborated on several books, most notably Drummer Hoff, winner of the 1968 Caldecott Medal.

Mr. and Mrs. Emberley have illustrated several other Let's-Read-and-Find-Out Science books. They live in Ipswich, Massachusetts.

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