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--- Bernard Cleyet <anngeorg@PACBELL.NET> wrote:
A very quick search (galactic rotation planetary revolution) yields
this student paper:
http://www.pha.jhu.edu/~akir/Seminar/seminar.html
bc
I skimmed the Johns Hopkins paper as Bernard did and found it quite
informative regarding the formation stages of the rocky planets. But it
did not touch on the subject that I have wondered about for many years
-- how long the earth required to grow to its present size.
We often read that the earth was formed 12 billion years ago. But did
that formation extend over a million years, or longer, or shorter? Do
the current models of planetary formation give a time for this?
Paul O. Johnson
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