What does it mean when they say the universe is expanding

STTGL Vs What if Ultron - Battles - Comic Vine

What does it mean that the universe is expanding onto itself? - Quora

The Big Call Universe Transcript, On the one hand, we have the expansion rate that the Universe had initially, close to the Big Bang.

Is Universe Expanding?

Why Is The Sky Dark At Night?

AST 101 CH 1, 2, and S1 STUDY GUIDE Flashcards

The Missing Piece in the Puzzle of Space, by Rushil, TechTalkers

What do we mean by the expansion of the universe? What is expanding? - Quora

Is Universe Expanding?

If the Universe Is Expanding, What Is It Expanding Into?, Latest Science News and Articles