Which of the following discoveries would prove that the Universe is NOT isotropic,assuming all are made on very large scales?
A) a higher cosmic microwave background toward the South Celestial Pole than elsewhere
B) that most galaxies have a peculiar motion toward the Great Attractor
C) a larger galaxy density toward the North Celestial Pole than toward the South Celestial Pole
D) all of the above

Question

Quizplus · Accepted Answer

All three discoveries suggest a directionality or asymmetry in the large-scale structure of the Universe, which would contradict the assumption of isotropy. Option A suggests a direction of higher temperature in the CMB, option B indicates a directional flow of matter, and option C indicates a variation in galaxy distribution. Therefore, all of these options contradict the assumption of isotropy.

Which of the Following Discoveries Would Prove That the Universe