OH, MY GOD! All I'm reading here is a bunch of closed-minded fools. So tell me, where exactly do you get all your information about physics? From scientists who have been led to believe everything they have read in their textbooks? From those who have conducted experiments only to find out that they were wrong, but told they have to report the findings as they were taught, and not as they really are?
We on this planet, in this existence, know nothing of physics. Gravity, for F*** sakes has been taught as the force pulling us toward the earth because the earth spins. Hello, McFly! Think, McFly, think! Wouldn't that be centrifical force from the earth spinning? And, wouldn't that throw us off? Centrifical force pushes things outward, not pulls things inward! So, you think you know all this big, bad information on physics, when really, you know jack s**t!
Stop thinking in the 3 dimensional, 5 sense reality for a second and get your big inflated head out of your arse and look at what makes sense, and NOT what you were told and led to believe.
A hollow planet can exist. As for Mars being hollow, who knows, anything's possible. Life on mars has always existed and still exists to this day. We'll never hear reports of that from our government and the other agencies involved. And, for the really closed minded guy who said that 9/11's not an inside job, pull your stinkin head out of your ass, will ya?