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

Responses

expansion of the universe
expansion of the universe

motion of the galaxy
motion of the galaxy

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

The Big Bang theory
The Big Bang theory

temperature of the galaxy
temperature of the galaxy

composition of the universe

1 answer

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

  1. Expansion of the universe - The redshift observed in the hydrogen absorption spectrum indicates that galaxies are moving away from us, which is evidence of the universe's expansion.

  2. Motion of the galaxy - The shift can also indicate the relative motion of the galaxy in space, providing information about its velocity.

  3. The Big Bang theory - The observations of redshift and the expansion of the universe support the Big Bang theory as they suggest that the universe began from a hot, dense state.

Thus, the correct answers are:

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