As evidence supporting the Big Bang theory, what does the redshift of light from galaxies indicate?(1 point)

Responses

The universe is mainly hydrogen.
The universe is mainly hydrogen.

The universe is cooling off.
The universe is cooling off.

The universe is 13.8 billion years old.
The universe is 13.8 billion years old.

The universe is expanding.

1 answer

The correct response is:

The universe is expanding.

The redshift of light from galaxies indicates that they are moving away from us, which is a key piece of evidence for the expansion of the universe as described by the Big Bang theory.