The feature known as Lunar-X visible only for a few hours on the moon surface.

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Photo credit: © Luis Argerich / Stocktrek Images / Alamy / Afripics
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Keywords: astronomy, background, black, blanchinus, caille, crater, crisis, crisium, detail, horizontal, la, lunar, mare, moon, nearside, night, outdoors, part, phase, photography, purbach, sea, semi-circle, serenitatis, serenity, space, surface, terminator, tranquility