Question

question 1-3
which prediction of the big bang theory was confirmed by the discovery of cosmic microwave background radiation?
○ the acceleration of the universe’s expansion
○ the existence of black holes at the centers of galaxies
○ the universe has been steadily warming since the big bang.
○ the early universe was a hot, dense state and has been expanding and cooling ever since.

Explanation:

Cosmic microwave background radiation (CMB) is the residual heat from the early hot, dense universe predicted by the Big Bang. As the universe expanded, this initial hot radiation cooled to the microwave frequency we detect today, directly confirming the universe's hot, dense origin and subsequent expansion/cooling. The other options are unrelated: cosmic acceleration is linked to dark energy, black hole galactic centers are unrelated to CMB, and the universe has cooled, not warmed, since the Big Bang.

Answer:

The early universe was a hot, dense state and has been expanding and cooling ever since.