What does it mean when they say the universe is expanding?
Universe could collapse in on itself sooner than expected
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AST 101 CH 1, 2, and S1 STUDY GUIDE Flashcards
How fast is the universe expanding? Galaxies provide one answer.
Is Universe Expanding?
The mystery of how big our Universe really is
What does it mean when they say the universe is expanding?
AST 101 CH 1, 2, and S1 STUDY GUIDE Flashcards
AST 101 CH 1, 2, and S1 STUDY GUIDE Flashcards
What does it mean to say that the universe is 'expanding' when there is nothing for it 'expand' into? - Quora
Our universe is actually 27 billion years old, almost double the current age estimate •