Talk:Billion years

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)

Gya superseded by Ga
I believe that Gya has been superseded by Ga in technical literature.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)


 * No, Gya has not been superseded.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)