PHOBOS is one of the Moons around Mars. Here is a close up photo of it, and it looks like it has a huge crater on it. If this is a crater, something really BIG hit it sometime in it's distance past. After an impact like that, it should be moving really fast in the same direction. So, maybe it is not an impact crater ? Could it be - could it be - that it is an iron shell, hollow on the inside, and parked in orbit around Mars like our Moon was ? I think much of this will come to light after NASA are forced to open their files, after people have "had enough".