Cosmology

I wonder why Robert Dicke, James E. Peebles, David Todd Wilkinson, and Peter G. Roll weren't included in the shared Nobel Price in Physics (1978), awarded to Arno Penzias and Robert Woodrow Wilson. After all, Penzias and Wilson didn't seem to be aware of what they stumbled upon when they first detected the remnants of the background radiation of the Big Bang (cosmic microwave background radiation, CMB).