Why Is the Smoothness of the Cosmic Microwave Background Radiation

Multiple Choice

Why is the smoothness of the cosmic microwave background radiation (CMB) considered a problem?

A) A smooth CMB implies that the expansion of the universe should be constant with time
B) Because a relatively smooth CMB implies the universe should be one gigantic galaxy, not many billions of billions of galaxies.
C) A universe this smooth should have matter spread out so evenly, that no stars or galaxies should be able to form.
D) Because two opposite sides of the universe could not have been in contact, and so should not have been able to reach similar temperatures.
E) A universe with a CMB this smooth should have ended in a Big Crunch by now.