Re: planetary and atmospheric rotation - origins, direction, etc
- From: Brian Davis <brdavis@xxxxxxxx>
- Date: Fri, 29 Feb 2008 05:37:29 -0800 (PST)
On Feb 29, 8:17 am, af...@xxxxxxxxxxxxxxxxxxx (John Park) wrote:
how unlikely is it that a moon could be formed--or
captured--in a orbit so large that the time scale for
deceleration is comparable to the age of the solar
system?
Well... that statement is in some form true for nearly every (still)
existing moon in the solar system, right?
I seem to recall there's at least one retrograde moon among
the outer planets that's not due to fall any time soon.
Triton, around Neptune. IMS, it's thought to hit the Neptune's Roche
limit in about 2 Ga from now (obviously, *very* roughly). The
timescale for tidal evolution depends a good bit on things like the Q
factor, which is very large for most gaseous planets, so the tidal
evolution of the orbit takes a long time.
--
Brian Davis
.
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