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yrral32 yrral32 61-65, M 4 Answers Feb 8, 2012

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its called a penumbra (didnt google)

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It's caused by icicles in the upper atmosphere that appear under certain conditions.

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Lunar flares, similar to solar flares.

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Could it be the Colgate ring of confidence? Or maybe the moon, bathed in sunlight, left a ring in the tub.

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