Heads up! Supermoon is here

Look! Up in the sky! It's supermoon!

Because our celestial neighbor is relatively close to Earth, these full moons will appear to be unusually large. That distance varies because the moon follows an elliptical orbit. When it's close and full, it appears bigger and brighter than normal, although the difference can be hard to detect.

The full moon Saturday may seem huge, but it's just an illusion caused by its position in the sky.

Two other supermoons will come later this summer on Aug. 10 and Sept. 9.

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APPHOTO XBG105: A perigee moon also known as a supermoon rises above Dojran Lake in southeastern Macedonia, on Saturday, July 12, 2014. The phenomenon, which scientists call a "perigee moon," occurs when the moon in its elliptical orbit is relatively close to Earth and seen from the Earth near the horizon, appears larger and brighter than other full moons. (AP Photo/Boris Grdanoski) (12 Jul 2014)

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APPHOTO NYDK206: One day before a "supermoon," Virgin America flight VX415 from New York (JFK) to Los Angeles (LAX) crosses the waxing gibbous moon on its final approach to Los Angeles Airport as viewed from Whittier, Calif., Friday, July 11, 2014. (AP Photo/Nick Ut) (12 Jul 2014)

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APPHOTO NYDK201: The moon rises Saturday, July 12, 2014 over metropolitan Manila in the Philippines in one of the three "Supermoon" occurrences for this year. The phenomenon occurs when the moon is near the horizon and appears larger and brighter than other full moons. (AP Photo/Bullit Marquez) (12 Jul 2014)

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