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NASA Clemantine photo of lunar glow in 1994

Lunar glow remains a mystery

Just before sunrise, Apollo 17 astronaut Eugene Cernan spotted a strange glow circling the horizon of the moon. He was expected to see some light from the sun, rays from the outer corona just as in sunrises on earth, but the shape and behavior of the glow—a crescent-shaped illumination with distinct beams—puzzled scientists. Even since…

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