Tonight's (July 31) moon will be a gorgeous sight, but it won't look different than any other full moon. The term Blue Moon has come to refer to the second full moon in a given month (since full moons come around about every 29 days, most months only contain one). So set your sights skyward tonight, but don't expect a change in the moon's regular hue. NASA explained the July 31 Blue Moon in a video released earlier this week.
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