The sunlit crescent portion of the Moon is blocked by a filter. This allows researchers to measure earthshine on the Moon, as seen in the lower left of this image, created by the Big Bear Solar Observatory lunar on Dec. 12, 1999.
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The sunlit crescent portion of the Moon is blocked by a filter. This allows researchers to measure earthshine on the Moon, as seen in the lower left of this image, created by the Big Bear Solar Observatory lunar on Dec. 12, 1999. |
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