023 - Solar Corona

Image of the Moon taken by the Star Tracker camera onboard Clementine. The bright glow over the horizon is the Solar Corona (outer atmosphere) showing from behind the Moon. Craters at left are illuminated by Earthshine, the light reflected off the Earth and onto the Moon. The dark part of the Moon is on the Lunar Far-Side. Do not equate "Dark-Side" with "Far-Side": the Far-Side experiences the same day-night cycle (28 days) as the Near-Side.

It just happens to be night on the Far-Side in this image.