Question

How does our universe changed over time?

Answer 1

It’s a LONG time, and many changes. Mostly, it’s expanding.

Explanation:

It’s a LONG time, and many changes. Mostly, it’s expanding.
The following infographics are some of the better ones that I have found.
https://www.pinterest.com/pin/431923420489350073/
https://www.pinterest.com/pin/141089400803379810/