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GEOPHYSICAL RESEARCH LETTERS, VOL. 37, L09202, 4 PP., 2010
Precise mass determination and the nature of Phobos
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.
Originally posted by ZuluChaka
reply to post by Arken
Well nobody has proved that. Why could it not just as easily consist primarily of a very pourous material. It is quite a leap to assume that just because something is not as dense as you assumed it would be that it is therefore hollow.