'Extreme Supermoon' to Blot Out the Sky This Weekend

It's a werewolf party.

The moon is coming ... and it's bigger than it's ever been before. Scientists are calling this weekend's full moon an "extreme supermoon," as it will be making its closest pass to Earth in 18 years.

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221,567. That's how many miles the moon will be away from your house on Saturday night, the closest it's ever been in almost two decades.

That means if you go outside this weekend (around 7 p.m. is supposed to be the best time), and there are no clouds to obscure your view, the moon will appear up to 15 percent larger than usual. That's a big moon pie in the sky.

Of course, not everyone is excited about the event. For one, global tides are sure to be abnormally high. But some people also believe the supermoon could wreak havoc on Earth's natural cycles ... like earthquakes.

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Internet superstiion has it that the impending moon event somehow caused the recent earthquake that ravaged Japan. NASA disagrees.

"It was basically a normal day on Earth as far as the lunar gravity and tidal forces were concerned," astronomer Dave Williams told ABC. "Unless the Earth somehow 'knew' the supermoon was coming, I can't imagine any scientific connection between the two events."

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So don't expect massive tidal waves and gravitational armageddon this weekend. Just sit back and enjoy the show.