Talk:Billion years

This article was nominated for deletion on 5 September 2011 (UTC). The result of the discussion was keep.

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Astronomy

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Discussion

it should be merged

— Preceding unsigned comment added by 81.129.92.22 (talk • contribs) 11:10, 25 May 2007

Indeed.

Please sign your posts in talk pages, anyways. (you can use ~~~~ If you haven't an account, you can sign with your I.P. or find another way, but please sign.

(I'm obsessed with that rule :)

—Nethac DIU, would never stop to talk here—
22:23, 24 June 2007 (UTC)[reply]

Gya superseded by Ga

I believe that Gya has been superseded by Ga in technical literature. Anyone have a problem if I move this? Cheers - Williamborg (Bill) 03:48, 6 January 2010 (UTC)[reply]

No, Gya has not been superseded. Both terms are in use in the technical literature, and they are used differently. Ga just means a giga-annum (a billion years) and may also be used in contexts other than the past (such as half-lives of certain isotopes or future galactic evolution), whereas Gya means a billion years ago, denoting a specific point of time in the past. —Lowellian (reply) 17:23, 18 September 2011 (UTC)[reply]