What does it mean when they say the universe is expanding

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

What is meant by 'The Universe is expanding'? - Quora

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

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

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What Actually Expands In An Expanding Universe?