Suppose the expansion of the whole universe began only about 2 billion years ago, and before that the universe was static and not expanding. What should we expect in such a situation?
A) We would see redshifts increasing with distance until a distance of approximately 2 billion light years.
B) We would see a universe that was isotropic but not homogenous.
C) Distant galaxies would be much smaller than our own, since they have not been expanding for 13 billion years.
D) The cosmic microwave background would be perfectly uniform in temperature.
E) We would not expect evidence for a Big Bang.

Question

Quizplus · Accepted Answer

The correct answer is A because if the universe began expanding only 2 billion years ago, we would expect to see redshifts increasing with distance until a distance of approximately 2 billion light years. This is because light from galaxies that are farther away would have had less time to travel to us, and would therefore be redshifted less.

Suppose the Expansion of the Whole Universe Began Only About