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Might seem like a strange question, but why does the Earth move? Shouldn't it's gravitational field keep it in place? Wouldn't the space immediatly surrounding the Earth offer considerable resistance to its movement? Things on the surface of the planet have a hard time escaping the Earth's gravitational field, and yet the whole planet, as one, does it continuously. In the traditional model of gravity consisting of ball on top of a sheet, bending the sheet, the ball wouldn't be able to just get out of its hole without considerable energy, that movement then would expend some amount of energy, due to the "resistance of space", how much energy then wouldn't we need to have the Earth moving all this time? Is this a stupid question?