What do astronomers mean when they say that the universe is isotropic?
A) Far away parts of the universe look just like nearby parts.
B) All galaxies are spiral galaxies like our own.
C) Intergalactic gas has the same density everywhere in the universe.
D) The laws of physics apply everywhere in the universe.
E) The universe looks the same no matter what direction you look.

Question

Quizplus · Accepted Answer

When astronomers say that the universe is isotropic, it means that the universe looks the same no matter what direction they look. This is because the distribution of matter and energy is consistent throughout the universe, and there are no preferred directions or locations. This is supported by observations of the cosmic microwave background radiation, which is uniform in all directions.

What Do Astronomers Mean When They Say That the Universe