Earthshine - the faint illumination of the part of the moon not illuminated by sunlight, as during a crescent phase, caused by the reflection of light from the earth.
I often wondered why I could faintly see parts of the moon that weren't lit by the sun, and learned today that earthshine is responsible.
I often wondered why I could faintly see parts of the moon that weren't lit by the sun, and learned today that earthshine is responsible.