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Lets say, there is a planet 'x', with diameter 100 km with its gravitational forces extending upto 1000 km from the centre of planet, planet is in vaccum devoid of any environment upto 1000 km. now question is why its gravity extends only upto 1000 km ??As there is nothing to hinder gravity in its path, so i think, it is space which acts as resistance for flow of gravity, that means, if we compress space of thickness 1000, km gravitational forces will not be able to pass through it, in this way, we can construct a channel in space (tunnel),denying gravity and move with great speed, say light speed in space tunnel.
if there are billion of planets and stars interacting with earth, how the balance between forces have been maintained, how is earth in such a balanced motion ? i think gravitational forces too have limit like magnetic forces and they can not extend upto infinite distance, i will give u good reason for it.all heavenly bodies in universe have variable gravity, some have more, some less, that means gravity have varying strength, then you can not say that gravity of any strength extends upto infinity, so microgravity is only theoretical concept and not practical.DOES TWO BODIES AT INFINITE DISTANCE ATTRACT EACH OTHER, DEFINATELY NOT BECAUSE, TO ATTRACT SOME FORCE IS REQUIRED AND NO FORCE CAN EXTEND UPTO INFINITE DISTANCE.