The faint light reflected from Earth onto the Moon, making the dark part of the Moon faintly visible; also called ashen light.
Compound of 'earth' (Old English eorthe) and 'shine' (Old English scinan, from Proto-Germanic *skinan). A modern astronomical term describing Earth's reflection on the lunar surface.
Earthshine is essentially the Moon being lit by our reflected light—it's a beautiful reciprocity where Earth becomes a mirror in space, illuminating the lunar surface like a cosmic feedback loop.
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