if the universe was contracting what would happen to light from other galaxies as it reached earth A it would be red shifted, B it would be blue shifted, C it would be dimmer, D it would be brighter

Answer 1

If the universe were contracting, the light from other galaxies as it reached Earth would be blue-shifted (option B).

In a contracting universe, galaxies would be moving toward each other, which would cause the wavelengths of light they emit to be compressed, resulting in a shift toward the blue end of the spectrum. Conversely, in an expanding universe, light from distant galaxies is redshifted, as the wavelengths are stretched.

So, the correct answer in the case of a contracting universe is B: it would be blue shifted.