Lava tubes on Moon could be huge enough to hold cities |
We don't know if the moon actually has any subterranean lava tubes, but if they do exist, a new analysis suggests they could be enormous.
http://feeds.boingboing.net/~r/boingboing/iBag/~3/GuDbhIE7Fl8/lava-tubes-on-moon-could-be-hu.html
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