Re: Moon as bookends
- From: "Perplexed in Peoria" <jimmenegay@xxxxxxxxxxxxx>
- Date: Thu, 12 Oct 2006 00:22:01 -0400 (EDT)
"Bob Kolker" <nowhere@xxxxxxxxxxx> wrote in message news:egj90s$2p22$1@xxxxxxxxxxxxxxxxxxxxxx
TomHendricks474@xxxxxx wrote:
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.
How do conclude that the Moon is coming back? It shoud receed until a
tidal lock happens. When the earth and moon have the some roation period
and revolved around a common center of gravity why should the moon come
back?
As I recall the story, we are currently in a regime in which lunar-induced
tides cause a slow transfer of angular momentum from the rotating Earth to
the orbiting moon.
Then, after tidal lock, the remaining solar tides will cause a very
slow transfer of angular momentum from the revolution of moon about Earth
to the revolution of Earth/moon pair about the sun. But it will take
'billions and billions' of years. We have more urgent things to
worry about.
.
- Follow-Ups:
- Re: Moon as bookends
- From: Paul Ciszek
- Re: Moon as bookends
- From: Bob Kolker
- Re: Moon as bookends
- References:
- Re: Moon as bookends
- From: Bob Kolker
- Re: Moon as bookends
- Prev by Date: Re: Guy A Hoelzer <hoelzer@unr.edu>
- Next by Date: Re: recombination question
- Previous by thread: Re: Moon as bookends
- Next by thread: Re: Moon as bookends
- Index(es):
Relevant Pages
|
