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Ga Geologically

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Recently, while reading a paper on Geologic time and the age of the earth, I encountered Ga and wondering what it was, I came here, but did not find it. Perhaps someone could enlighten us?

Definition of Ga at Sun

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At Sun it says that the sun is expected to live to be 10 Ga, but there is no mention of a period of time in this dis-ambiguation page. Can anyone add what Ga stands for when it refers to a period of time?? Georgia guy 19:55, 22 Jan 2005 (UTC)

Ga means 1 billion years. Similarly Ma means 1 million years. I think we Ga (unit) and Ma (unit) pages. Tonderai 18:07, 15 Apr 2005 (UTC)