Why Is the Cosmic Microwave Background (CMB) So Cold, If

question 7

Multiple Choice

Why is the cosmic microwave background (CMB) so cold, if the early universe was so hot?

• A) Enough time has passed for matter in the universe to release enough heat to cool down.
• B) The CMB constantly interacts with atoms, which effectively cools down the photons.
• C) The big bang was initially hot but the CMB was released from cold material much later on.
• D) The expansion of the universe has redshifted those photons to an effectively cooler temperature.

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Definitions:

Ideological Arguments

Discussions or debates grounded in sets of beliefs or principles that influence the way individuals think about society, politics, economics, or culture.

Implicit Assumptions

Implicit assumptions are unstated beliefs or ideas that are taken for granted as part of an argument or decision-making process.

Ideological Reasoning

Thinking that is heavily influenced by a set system of beliefs or ideals.