Which evidence supports the big bang theory? check all that apply many galaxies exist. planetesimals form in debris disks. most galaxies are moving away from us. uniform background radiation is detected in every direction. galaxies spin faster than they should based on visible matter.

1. Most galaxies are moving away.

2. Uniform background radiation is detected in every direction.

Explanation:

Big Bang Theory describes the beginning of the universe. According to the theory, the universe was confined at a point having infinite density and extremely high temperature. With the Big Bang about 13.7 billion years ago, the universe started expanding and cooling down. The evidence that supports the Big Bang Theory is:

1. The red-shift of the galaxies: Most galaxies are moving away from us. Since the universe started expanding 13.7 billion years ago, on larger scale, all the galaxies are observed to be moving away. The spectrum of the galaxies shows red-shift.

2. Uniform background radiation can be detected in every direction. It is considered to be remnants of early stages of universe.

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