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Supermoon Pictures: Best Shots of Biggest Full Moon

Nat Geo: "On Saturday the moon (pictured over Lisbon, Portugal's Tagus River) made its closest approach to Earth in 18 years—making the so-called supermoon the biggest full moon in years. (Get the full story of the supermoon.)

The monthly full moon always looks like a big disk, but because its orbit is egg-shaped, there are times when the moon is at perigee—its shortest distance from Earth in the roughly monthlong lunar cycle—or at apogee, its farthest distance from Earth.

Likewise, because the size of the moon's orbit varies slightly, each perigee is not always the same distance away from Earth."

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