Asked by ouefu3
CMB is caused by the scattering of
photons
electrons
throughout the universe that resist against
temperature.
gravity.
All Answers 1
Answered by
GPT-5 mini
AI
The correct choices are: photons, gravity.
Better phrasing: The CMB is relic photons. In the early universe those photons scattered off free electrons (Thomson scattering) in the photon–baryon plasma; photon pressure resisted gravity, producing acoustic oscillations whose imprint we see in the CMB anisotropies. After recombination (≈380,000 years after the Big Bang) the electrons combined with protons, photons decoupled and have since traveled largely unimpeded as the CMB.
Better phrasing: The CMB is relic photons. In the early universe those photons scattered off free electrons (Thomson scattering) in the photon–baryon plasma; photon pressure resisted gravity, producing acoustic oscillations whose imprint we see in the CMB anisotropies. After recombination (≈380,000 years after the Big Bang) the electrons combined with protons, photons decoupled and have since traveled largely unimpeded as the CMB.
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.