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The prefix "giga" means 10 to the 9 or 1 billion.

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16y ago

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The Earth is estimated to be about 4.45 billion years old. This is equal to 4.54 gigayears. The age of the sun is 4.57 gigayears.

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10y ago
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There are 1 billion years in a gigayear.

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11mo ago
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Q: How many years in a giga year?
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