Newly-discovered lunar cave would be great for a moon base

Japan’s Selenological and Engineering Explorer (Selene) probe discovered a 50-meter wide by 50-meter deep opening underneath the Marius Hills region using a radar system designed to peer underground. After more readings, the Japan Aerospace Exploration Agency (Jaxa) surmised that the chasm was 50 km (31 miles) long by 100 meters wide, structurally sound and filled …

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