What does it mean when they say the universe is expanding?

Ask Ethan: If The Universe Is Expanding, Are We Expanding, Too?

What if the Universe has no end?

The Implications of Hubble's Law: An Expanding Universe Astronomy 801: Planets, Stars, Galaxies, and the Universe

Is Universe Expanding?

STTGL Vs What if Ultron - Battles - Comic Vine

Finding God.

How Big Is the Observable Universe?

True: The expanding Universe doesn't conserve energy - Big Think

PHYSICAL-SCIENCE-Q4-SLM17.pdf - Physical Science 11 Science - Grade 11 Quarter 4 - Module - 17: The Expanding Universe! Part 1 First Edition