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RE: (IAAC) Burnout or Extinction - Which Will Come First? - Please respond!



I believe the end will come from heat.  Not so much because of gravitational
lock, but because the sun will slowly start entering its red giant phase as
it moves off the main sequence.  Seems to me I've read that this will start
in another billion years or so.  The sun will not actually move off the main
sequence until another 3 or 4 billion years passes, but the process starts
sooner.

This is all based on memory and at my age, that ain't necessarily a good
thing!


Eric Greene
Erg@america.net
The Unofficial C-8 Home Page
http://www.america.net/~erg
The Star Party Web
http://people.atl.mediaone.net/ergreen/starparty.htm


-----Original Message-----
From:	owner-netastrocatalog@latrade.com
[mailto:owner-netastrocatalog@latrade.com] On Behalf Of ALH84001KC@aol.com
Sent:	Tuesday, January 05, 1999 6:32 PM
To:	netastrocatalog@latrade.com
Subject:	(IAAC) Burnout or Extinction - Which Will Come First? - Please
respond!

Hi all,

	I'm working on a project for school, and I need  as many opinions as I can
get.

	 Description of project-  I want to determine which will happen first- will
the sun end its life(approx 4.5 billion years) and end all light for
Earth(the
extreme cold would kill the human population on Earth as well as almost
everything else,) or will the Earth slow down in rotation to the point where
the days are too long, and the great heat would destroy all human existance.
	Does anybody remember how much the Earth slows down a year?  I read the
amount, but forgot it.  I think it's about a second or so- maybe less.
	I need as many responses to this as possible(I don't think it is possible
to
know exactly, that's why I'm getting many guesses- then I will average them
out.)-  As the Earth slows down in rotation, the days and nights will
obviously become longer- so long, theat humans can't survive the harsh
cold/hot climate.  At what point do you think that will that happen?  How
long
would a day/night have to be to destroy all human existance on this planet?
	To keep from filling everyones boxes with e-mails, could you please respond
to me directly-       alh84001kc@aol.com       -
	Thank you to all those who contribute.  I appreciate it very much.

	Matthew Martin       -       Lat.- 21 18' 25"  Long.  157 51' 30"
	Member- Hawaiian Astronomical Society
	Member- The Meteoritical Society

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