Which does the shift of the hydrogen absorption spectrum of a galaxy provide evidence for? Select the three correct answers.(2 points)

Question

Responses

The Big Bang theory
The Big Bang theory

temperature of the galaxy
temperature of the galaxy

number of stars in the galaxy
number of stars in the galaxy

motion of the galaxy
motion of the galaxy

expansion of the universe
expansion of the universe

composition of the universe
composition of the universe

Answer 1

The shift of the hydrogen absorption spectrum of a galaxy provides evidence for the following three concepts:

1. Motion of the galaxy - The shift can indicate whether a galaxy is moving towards us or away from us (redshift or blueshift).

2. Expansion of the universe - The redshift observed in distant galaxies supports the idea that the universe is expanding.

3. The Big Bang theory - The observations of redshift and the distribution of galaxies contribute to the evidence for the Big Bang theory.

So the correct answers are:

• Motion of the galaxy
• Expansion of the universe
• The Big Bang theory