Look, Up in the Sky - It's Supermoon

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Sky watchers are preparing for what is being dubbed "Supermoon." Space.com is trumpeting the biggest full moon of the year, scheduled for this coming weekend, or as the website calls it: Supermoon Alert.

The moon will come within 221,902 miles of Earth late Saturday night, and it will also be a full moon, ready to offer an extra-bright, extra-big show. Space.com said this weekend's full moon should be about 16 percent brighter than average because of its proximity.

Also, the Earth's tides are expected to be particularly high and low. When the moon comes closest to our planet - known as perigee - the moon exerts about 42 percent more tidal force than it will during its next cycle two weeks later.

We're reminded that to view the supermoon at its best effect, we should look as it rises or sets. When the moon is tucked behind buildings or trees, an optical illusion makes it appear much larger.

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