Re: Solar System's rotation

["Paul O. Johnson" <hodgepoj@YAHOO.COM>]

--- 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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