Debra (USA: OR) (2016/11/22): Description: Something to Think About...Did you know? * There are more than 200 billion billion stars. * Stars are made mostly of hydrogen and helium. Why can't we see stars during the day? Why are stars different colors? Have you ever seen a falling star? It really isn't a star at all. It's a meteor. A meteor is a piece of metal or rock that burns up as it falls through the air.
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