temperature of universe 1032 K 1027 K 1015 K 1013 K 3 K Gluon strong force 1 TOE force GUT force Electroweak Photon electromagnetic force 1e-2 W, Z boson weak force 1e-6 Graviton gravity 1e-39 time after 10-43 s 10-35 s Big Bang .10-12 s 10-6 s 5 x 1017 s ( = now)