Down The Lunar Rabbit Hole

July 12 – Newly discovered pits on the Moon could be entrances to a geologic wonderland of underground caves and tunnels. “They could be entrances to a geologic wonderland,” says Mark Robinson of Arizona State University, principal investigator for the LRO camera. “We believe the giant holes are skylights that formed when the ceilings of underground lava tubes collapsed.”
http://science.nasa.gov/science-news/science-at-nasa/2010/12jul_rabbithole/

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