What is the phenomenon called earthshine, visible on the Moon?

Answer

Sunlight reflected from Earth onto the dark portion of the Moon

Earthshine occurs when sunlight hits the Earth and is then reflected back onto the dark, unlit portion of the lunar surface. This faint light allows observers to see details on the side of the Moon not directly illuminated by the sun, provided their eyes have adapted to the darkness.

What is the phenomenon called earthshine, visible on the Moon?

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