You might want to step outside early tomorrow morning (July 12), when a bulging "supermoon" will glow brightly in the sky. At this point, known as "perigee," the moon is about 30,000 miles (50,000 kilometers) closer to the planet than at its farthest point, or "apogee." [In Photos: Glitzy Images of a Supermoon] Supermoons gained attention last year, when a June 2013 full moon was 14 percent bigger and 30 percent brighter than other full moons, according to NASA. To the casual observer, it's not easy to tell the difference between a normal full moon and a supermoon.
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