The CMB Can Be Regarded as a "Wall" Beyond Which

question 17

Multiple Choice

The CMB can be regarded as a "wall" beyond which we cannot see light because

• A) photons couldn't leave the hot plasma before the recombination period.
• B) we haven't discovered the technology to detect light from earlier epochs.
• C) galaxies absorb all the photons from earliest times, closer to the Big Bang.
• D) there existed only massive particles within the universe in the first 380,000 years of existence; there were no photons.
• E) behind the CMB "wall" there is a huge black hole that doesn't allow light to escape.

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