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Originally Posted by glatt
So does anyone know what makes the moon slightly illuminated even when it's within the umbra of the Earth's shadow? It's a red color then. From the Moon's perspective, the Sun is hidden behind the Earth, so I bet the Sun is shining through the thin layer of the Earth's atmosphere, and it's the color of a sunset. So the Moon is red as a result.
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That's pretty much it. The scattering effect of the atmosphere pulls some sunlight around the edges of the Earth, getting redder the whole way.