Bacci, I'm not sure that anyone knows how two objects 'know' about each other. Your question could equally apply to gravity - how does the moon 'know' the earth is here? And electricity - how does the cloud know it is full of charged electrons that need to travel to the earth through lightning to reduce their electrical potential? I guess the same applies to the strong and the weak nuclear forces as well.
Wikipedia says "these interactions can usually be described, in a set of calculational approximation methods known as perturbation theory, as being mediated by the exchange of gauge bosons between particles" but this is beyond me.
I suggest you do a physics degree to be able to answer all those questions, seriously!
http://en.wikipedia.org/wiki/Fundamental_interaction
P.S. It is the Higgs boson they are searching for with the large hadron collider (LHC). This is what may help to explain how gravity works.
P.P.S. Dare I say it, maybe you might want to do a few climate science electives while you are there :-)
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