Why Is the Smoothness of the Cosmic Microwave Background Radiation

question 24

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.

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