vacuum energy / photon energy densities / large gas cloud collapses / dark energy densities / dark energy density / energy density / respective energy densities / matter-energy density / photon energy density / photonic energy density / kinetic energy / dark energy / matter-dark energy universe / less matter energy density / gravitational binding energy / radiation energy density / non-zero dark energy / non-zero dark energy density / matter energy-density / gravitational potential energy / energy densities / /