Suppose that the entire Universe began to contract (collapse) right now. Five bi

Question

Suppose that the entire Universe began to contract (collapse) right now. Five billion years from now, an astronomer looking at the spectra of galaxies. What would be the changes noted?

A. Spectral lines from planets and stars in the Milky Way would be all blue shifted.
B. Spectral lines from galaxies within a distance of less about 5 billion light years would be red shifted.
C. Spectral lines from galaxies farther than 5 billion light years would be blue shifted.
D. Spectral lines from galaxies within a distance of less about 5 billion light years would be blue shifted

Explanation / Answer

A isn't true. The speed of light is only so fast in the universe.

B is wrong.

C is wrong.

D is correct. The contraction towards us will cause a blue shift, and after 5 billion years that blue shift light will finally reach us.

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