European Space Agency Indicates Mars’ Moon Phobos is Hollow and Artificial
Extract from the abstract here: http://onlinelibrary.wiley.com/doi/10.1029/2009GL041829/abstract
"We conclude that the interior of Phobos likely contains large voids. When applied to various hypotheses bearing on the origin of Phobos, these results are inconsistent with the proposition that Phobos is a captured asteroid."
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