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Re: Solar System's rotation



These people also aren't sure how long it took (from the summary result from
google) either:

http://pubs.usgs.gov/gip/geotime/age.html

I'm too lazy to ask an astronomer. Tell them you're 14 and the answer will
come quicker.

askanastronomer@ucolick.org

bc Who used to work next door to Lick's CCD lab.

P.s. Don't. The question, I think, will betray you. You could appeal to
professional courtesy. However, they don't like designing astronomical equip.
for astronomers!

http://www.ucolick.org/~mountain/AAA/



"Paul O. Johnson" wrote:

--- 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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