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How to pronounce "billion-year"

Matches found: 4 (355 ms)

that first appeared on our planet 3.5 billion year ago,

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Duration: 4s Details

The reason there is a billion-year gap

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Duration: 4s Details

throughout the universe and its 13.7 billion year history.

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So, our planet has spent the vast majority of its 4.56 billion year history

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Duration: 10s Details