Question

due to gravitational force the things come down why it's happen
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Answer 1

this is because every two objects between which the gravitational force is exerted are attracted to each other...

the body having lighter mass will get attracted to the body heavy body..

just like we are attracted to earth because we have very less mass in comparison to earth..

hope it helps u brotha..

plz mark it dude

Answer 2

This was the thing which Einstein explained. Newton discovered gravity, i.e, law of gravitation. Einstein discovered mechanism of gravity and why it happens. Now we people are struggling to figure out from what thing is gravity made of, i.e, a search and formulation of graviton and combining Quantum mechanics and general relativity.

You may refer more about general theory of relativity (GR) by searching. you'll get lots of stuff. note: GR works for inertial frames of reference. (accelerating) and special relativity (SR) for non-inertial.