The Expansion of the Universe Will Eventually Render the CMB

question 51

Multiple Choice

The expansion of the universe will eventually render the CMB invisible because its photons will

• A) have wavelengths that will exceed the size of the observable universe.
• B) be swamped by the light from the ever-increasing star formation rates in the universe.
• C) not have enough energy to escape the gravity of degenerate stellar remnants.
• D) all combine and again produce pairs of massive particles.
• E) not escape the strong gravity of supermassive black holes the size of galaxy clusters.