The acceleration due to gravity for any object decreases with distance from it. Specially, gravity scales with the inverse of the square of the distance.
Actually,the acceleration due to gravity(g) depends on the distance from it's center of the earth.We know that g is inversely proportional to 1/r sq. so that when the distance from earth increases the acceleration due to gravity decreases as a result space the value of g is acceleration due to gravity is low in the space.
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