Re: Moon as bookends
- From: "Perplexed in Peoria" <jimmenegay@xxxxxxxxxxxxx>
- Date: Wed, 11 Oct 2006 13:18:20 -0400 (EDT)
<TomHendricks474@xxxxxx> wrote in message news:eggknn$2m3u$1@xxxxxxxxxxxxxxxxxxxxxx
Some say our moon helped stabilize earth and its temp.
cycle in such a way that life would have difficulty starting
anywhere but such a dual system planet like Earth and Moon.
But our Moon may also be bookends to life on earth.
It is difficult to see life starting before the mars like
planetoid hit earth and broke off the crust that became the
moon. Thus life here could only start after that collision -
that is one bookend.
At some point the escaping moon will stop, turn around,
and begin to approach earth. It may well break up and rain
down on earth - ending life here.
Thus life will end after that collision period. That is
the other bookend.
We are going to run into the expanding sun bookend long before
we run into the returning moon bookend. Besides, the moon
doesn't return until the day slows (due to tides) to the same
period as the month. So, even if the sun doesn't do what we
expect it will do in the next few billion years, the Earth's
climate will go all to hell long before we start getting showered
with moon rocks.
.
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