Question

There is a theory that gravity could pull galaxies back together, causing a reverse big bang.

Answer 1

Answer: The expansion of the universe is accelerating.

Explanation: Every millisecond the expansion slowly but surely speeds up.

Answer 2

Answer:

I would say A: "Background radiation is present.

Explanation:

B, C, and D are proving that the universe is still expanding to this very second, the faster the universe expands the bigger it gets (obviously). Gas giants forming farther away from the Sun, once again, shows that the universe is expanding, and the same thing applies with B.