After the Big Bang,as the universe cooled and protons and electrons combined so that the universe became neutral,what important consequence happened?
A) Photons began to travel freely through the universe.
B) Neutrinos ceased to interact with normal matter.
C) Dark matter ceased to interact with normal matter.
D) Protons and neutrons combined to form nuclei such as deuterium and helium.

Question

Quizplus · Accepted Answer

As the universe became neutral, photons were no longer scattered by free electrons and were able to travel freely through the universe. This is known as the cosmic microwave background radiation, which is a key piece of evidence for the Big Bang theory. Neutrinos and dark matter were not affected by this change, and the formation of nuclei happened later during the process of cosmic nucleosynthesis.

After the Big Bang,as the Universe Cooled and Protons and Electrons