What does it mean when they say the universe is expanding?
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Universe could collapse in on itself sooner than expected
PHYSICAL-SCIENCE-Q4-SLM17.pdf - Physical Science 11 Science - Grade 11 Quarter 4 - Module - 17: The Expanding Universe! Part 1 First Edition
The universe is expanding, but what exactly is it expanding into?
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Expansion of the universe - Wikipedia
Expansion of the universe - Wikipedia
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Universe Expanding Faster Than We Thought — a 'Crisis in Cosmology
