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What is Earthshine?

We see the Moon because of reflected sunlight (like the planets, the Moon does not generate its own light). At times, however, the dark part of the Moon glows.

During a crescent moon, only a sliver of sunlight is reflected to Earth (Part 1 in this animation). But when the Moon is a crescent, the rest of it is illuminated by sunlight reflecting off the Earth, hitting the night side of the Moon, and bouncing back to Earth (Part 2). In fact, if you were on the Moon when it was a crescent, you'd see a full Earth.

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