> Which is exactly what one would expect from a body that
> accreted from the debris of an impact.
Its actually the exact opposite one would expect to find and is unrelated to hollow spaces. Do you have a link for that statement? For such sizable hollows to form there must be something there that is now gone, namely a gas or liquid (water or lava) that was trapped or created in the bodies cooled state and later ejected by some process. There are many interesting holes on the Lunar surface like this:
which are speculated to be lava domes (lava tube skylights). Regardless, finding these holes suggests "...it may have confirmed a theory that scientists had held about the Moon since the 1960s - its surface may hide a vast network of tunnels".[www.news.com.au]
Post Edited (28-Jan-13 23:45)