Natural bridge on the Moon

Natural bridge on the Moon
Natural bridge on the Moon In a first, the Lunar Reconnaissance Orbiter camera team spotted a natural bridge on the Moon in an image from King crater, on the lunar farside. The bridge appears to have formed when two adjacent sections of roof collapsed into an underground void, leaving a small section of uncollapsed roof between them. Such collapses are commonly theorized to form into lunar lava tubes, but this region is not associated with lunar volcanism; instead, the collapse appears within the impact melt sheet of King, a very fresh, moderately sized (77-kilometer-diameter) crater. NASA / GSFC / ASU

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