Answer :

The two most common and huge affects are mass and distance. The bigger the harder it is to control gravity and same with distance. The farther you are away, the less pull you have . 
AL2006
The only things that affect the forces of gravity are ...

-- the product of the masses of the two objects, and

-- the distance between the centers of the two objects.
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-- The strength of the gravitational force is directly proportional to the product of
the two masses.  If the product of the two masses is multiplied by ' Q ', then the
strength of the gravitational forces between them is also multiplied by ' Q '.

-- The strength of the gravitational force is inversely proportional to square of
the distance between the centers of the two masses.  If the distance between
their centers is multiplied by ' K ', then the strength of the gravitational forces
between them is multiplied by 1/K² .

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