The full moon on Saturday night will appear especially huge because the moon will be closer to the earth than it usually gets. Scientists--who are great at naming things--call this simply a "supermoon." No worries--the moon's not falling. (That's a fact for kids, for whom the moon's falling can be a real concern.) It's just that the moon follows an elliptical orbit and when it flies by on Saturday it will dip down to get a better look at what's happening on earth, whose gravitational pull (with some help from the sun) guides it. Just because the supermoon isn't falling doesn't mean it can't cause trouble: werewolves aside, the vision of the supermoon can be startling--especially on a busy Saturday night--and a distraction to drivers.
If you miss this supermoon, though, you're in luck. The other two full moons this summer--on August 10 and September 9--are also supermoons. The moon will be closer by a distance about equal to the diameter of the earth--that's a lot until you consider that the moon is about 30 earth diameters away.
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