[meteorite-list] Fw: term definitions and usage
From: Chris Peterson <clp_at_meteoritecentral.com>
Date: Sun, 24 Jul 2011 19:37:02 -0600 Message-ID: <4E2CC8BE.6020804_at_alumni.caltech.edu> Ga is billions (gigayear) of years. Ma is millions (megayear) of years. "a" is the most commonly used symbol for year (from annus) in scientific publications. Chris ******************************* Chris L Peterson Cloudbait Observatory http://www.cloudbait.com On 7/24/2011 7:26 PM, Richard Montgomery wrote: > > Hello List, > > Another neophyte question (I can use some clarification): when / how are > the time-measurements (relatively speaking) designations "Ga" and Ma" > used, and their respective differences? > > (I believe I know the difference through context, but why go through so > many papers and texts with the question-mark over my head?) > > Sincerely, > Richard Montgomery Received on Sun 24 Jul 2011 09:37:02 PM PDT |
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