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

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Wiki User

16y ago
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Wiki User

10y ago

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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AnswerBot

6mo ago

There are 1 billion years in a gigayear.

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Q: How many years in a giga year?
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