The Photons That Enter Microwave Detectors Today (And That Astronomers

question 111

Multiple Choice

The photons that enter microwave detectors today (and that astronomers interpret as the cosmic microwave background radiation) had their last interaction with matter

• A) at the instant of the Big Bang.
• B) during the inflationary epoch.
• C) during the era of recombination.
• D) at the time of symmetry breaking.

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