Energy is a propery of a system. E.g. potential energy of a body in a gravitational well of another body, or kinetic energy of a body w/r to some reference frame.How is ~73% of the universe made up of Dark Energy if energy doesn't take up physical space?
Not all bosons are massless. Mesons are bosons and have a mass. But, of course, all bosons are volume less, since they are not subject to Pauli's dxclusion principle.Force carriers, called bosons, are massless and do not occupy space, only massive particles, called fermions, occupy space so there is no limit on the number of bosons that can occupy any given space.