Unlike magnetism and electricity there is no repulsive force in gravity in
expanding universe. Gravity is mediated through time differential produced by
differential expansion of space around large masses.  When a mass composed of
billions of atoms with electrons moving with tremendous velocities is placed in the
time differential, the inner motion of the electrons is converted into external linear
motion which is perceived as the attractive force.  Gravity produces acceleration
towards slower expansion of space and slower time which is at the center of the
large masses. Gravity is a weak force as it is mediated through time differential
and not by direct interaction of the particles.  

     For gravity to be repulsive the expansion of space will have to be faster in the
center of a celestial body. This cannot happen in an expanding universe. In a
contracting universe however gravity may be repulsive.  The contraction of space
should be fastest in the center of celestial bodies producing a faster time and
reversing the time differential and producing repulsive gravity thus completing the
missing symmetry.
WHY GRAVITY IS ALWAYS ATTRACTIVE
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