First prediction from Big Bang model: Cosmic Background Radiation
					� Look out (and back in time) to place� where H became neutral � Beyond that the high density ionized H forms an opaque �wall� � Originally 3000 K blackbody radiation � The material that emitted it was moving away from us at extreme speed � That v produces extreme redshift (z=1000), so photons all appear much redder, so T appears cooler � With red shift, get 2.7 K Planck blackbody � Should be same in all directions