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

Expansion of the universe - Wikipedia

Expansion of the universe - Wikipedia

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

Measuring the Expansion of the Universe: Surprising Discrepancies Hint at Inconsistency in the Composition of the Universe

The universe is expanding, but what exactly is it expanding into?

Expansion of the universe - Wikipedia

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

Mystery of the Universe's Expansion Rate Widens With New Hubble Data

Webb Confirms Accuracy of Universe's Expansion Rate Measured by Hubble, Deepens Mystery of Hubble Constant Tension

STTGL Vs What if Ultron - Battles - Comic Vine

Astronomy, Everyday Mysteries

What is the universe expanding into? - Sajan Saini