What does the universe expanding mean?

Answer 1

The distance between galaxies is increasing, pretty much in all directions. This suggests that space itself is expanding. We also now know the rate of expansion is in fact increasing.

Answer 2

If the Universe is still expanding, the distances between galaxies, on average, continues to increase. The fact that, on average, we observe galaxies to be receding from us is one of the fundamental observations that lead to our theories of the Big Bang. An expanding Universe is also consistent with Einstein's General Theory of Relativity.

Answer 3

Everything in the universe is sort of drifting apart, and new things are forming. Also, bonus info: Eventualy time will end. The expanding of the universe will cause gravity to cease affecting the earth, making it stop rotating. After that, it will rotate backwards.

Answer 4

Humans don't know if the entire universe is expanding. When we say the universe is ever expanding we mean the observableuniverse is ever expanding

The universe is every expanding because the stars billions and billions light-years away from us finally have their light reach the Earth. We eventually find these "newly discovered stars" and record the down so we know about them.

Answer 5

The average distance between stars in the Milky Way Galaxy is increasing with time.

Answer 6

The general tendency is for this distance to increase over time.