Once upon a time scientists believed there may be canals on Mars. That has long been disproven, but recent evidence suggests the moon may have a network of caves. Here’s more from NASA:
In re-analyzing radar data collected by LRO’s Mini-RF (Miniature Radio-Frequency) instrument in 2010, the team found evidence of a cave extending more than 200 feet from the base of a pit. The pit is located 230 miles northeast of the first human landing site on the Moon in Mare Tranquillitatis. The full extent of the cave is unknown, but it could stretch for miles beneath the mare.
Scientists have suspected for decades that there are subsurface caves on the Moon, just like there are on Earth. Pits that may lead to caves were suggested in images from NASA’s lunar orbiters that mapped the Moon’s surface before NASA’s Apollo human landings. A pit was then confirmed in 2009 from images taken by JAXA’s (Japan Aerospace Exploration Agency) Kaguya orbiter, and many have since been found across the Moon through images and thermal measurements of the surface taken by LRO.
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