What does it mean when they say the universe is expanding

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?

Astronomy, Everyday Mysteries

What does it mean when we say space is expanding? - Quora

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

Is Universe Expanding?

The Cosmological Argument for Theism, by Bryan T. Baker, Your Life Matters

Is Universe Expanding?

Astronomy, Everyday Mysteries

What does it mean to say that the universe is 'expanding' when there is nothing for it 'expand' into? - Quora

What does the expansion of universe mean? - Quora

What does it mean when we say space is expanding? - Quora

Fact Check: verify info at you – Apps on Google Play

Manuscript of the Universe