What faint phenomenon can sometimes allow visibility of the far side of the Moon during a New Moon?

Answer

Earthshine—sunlight reflected off the Earth and onto the Moon's dark side.

Even when the Moon itself is dark, sunlight reflected off the Earth onto the Moon's far side can sometimes cause a faint outline of the dark side to be dimly visible.

What faint phenomenon can sometimes allow visibility of the far side of the Moon during a New Moon?

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