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Researchers find evidence for cave accessible from surface – which could shelter humans from harsh lunar environment

Researchers have found evidence for a substantial underground cave on the moon that is accessible from the surface, making the spot a prime location to build a future lunar base.

The cave appears to be reachable from an open pit in the Mare Tranquillitatis (Sea of Tranquility), the ancient lava plain where the Apollo 11 astronauts Neil Armstrong and Buzz Aldrin first set foot on the moon more than half a century ago.

Analysis of radar data collected by Nasa’s lunar reconnaissance orbiter (LRO) revealed that the Mare Tranquillitatis pit, the deepest known pit on the moon, leads to a cave 45 metres wide and up to 80 metres long, an area equivalent to 14 tennis courts. The cave lies about 150 metres beneath the surface.