Question

question 4 (1 point)
what are two pieces of evidence for the big bang?
a temperature of the universe
b the universe is expanding
c the amount of galaxies
d cosmic microwave background (cmb) radiation

Explanation:

The Big Bang theory is supported by two key pieces of evidence. One is the observation that the universe is expanding, which was discovered through the redshift of light from distant galaxies (Hubble's Law). The other is the Cosmic Microwave Background (CMB) radiation, which is the afterglow of the hot, early universe predicted by the Big Bang model. The amount of galaxies (option c) is not a direct piece of evidence for the Big Bang, and the temperature of the universe (option a) is too vague without context.

Answer:

B. The universe is expanding, D. Cosmic Microwave Background (CMB) radiation