Question

What does the evidence provided about CMB tell us about the scattering of photons throughout the universe?


A.
They were scattered evenly throughout the universe.

B.
They were scattered more throughout the north and east of the universe.

C.
They were scattered unevenly throughout the universe.

D.
They were scattered more throughout the south and west of the universe.

Answer 1

C. They were scattered unevenly throughout the universe.

The CMB is extremely uniform overall but shows small anisotropies (temperature fluctuations) measured by COBE, WMAP and Planck, indicating photons were not scattered perfectly evenly—there were slight variations (uneven scattering) that seeded later structure formation.