Gravitons are considered to be the mediating particles of gravitational force just as photons are considered to be the mediating particles of electromagnetic force. Both have zero rest mass. If extreme gravity of black holes does not allow photons of light to escape, why does it not do the same with gravitons? In other words : Observations of the cosmos show that black holes exert tremendous influence on the nearby stars to the extent of deforming them. It means in spite of extreme gravity, gravitons are able to ‘operate’ between a black hole and a nearby star. Why doesn’t the black hole ‘suck’ the gravitons just like photons and disappear/disconnect from the universe? Thanks in advance.