Blue Sky Science is a collaboration of the Wisconsin State Journal and the Morgridge Institute for Research. The questions are posed by visitors to Saturday Science events at the Discovery Building, a monthly series that features interactive exploration stations centered around a particular topic. The Blue Sky Science team then sets out to find an expert to answer the questions. To view other videos in the series, see http://go.madison.com/bluesky. For more on the Morgridge Institute, see morgridge.org.
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One reason the moon has craters is because it gets hit by objects from space. It also has craters because in its past it had volcanoes, and volcanoes can create craters.