At about 1 part in $10^6$, we see small fluctuations in the temperature of the CMB. What do these fluctuations tell us?
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they prove that the cosmological principle is technically incorrect; the universe is, in fact, anisotropic on large scales.
they reveal the signatures of the large mass concentrations where subsequent galaxy clusters formed.
they reveal the technical limitation of the detectors on board the satellite.
they emphasize the limited value of general relativity.
they give us clues about the black-hole evaporation happening in the early universe.
