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Just when you think you have seen everything, LROC reveals a natural bridge on the Moon! Who would have thought? Natural bridges on the Earth are typically the result of wind and water erosion – not a likely scenario on the Moon. So how did this natural bridge form? The most likely answer is dual collapse into a lava tube. From the Apollo era, SELENE, and LROC images, we know that lava tubes did form in the Moon’s ancient past. SELENE and LROC images have raised the tantalizing prospects that lava tubes remain intact to this day. However this bridge did not form in mare (basalt), but rat