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How long will the sun remain a white dwarf?



 
 
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  #21  
Old July 20th 07, 07:45 PM posted to sci.astro.amateur,sci.astro,alt.astronomy,alt.astronomy.solar,uk.sci.astronomy
George Dishman[_1_]
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Default How long will the sun remain a white dwarf?


"Chris L Peterson" wrote in message
...
On Wed, 18 Jul 2007 13:59:15 GMT, Passing through
wrote:

....

Or at
least the lifetime before every particle is froced apart from al te
particles?


That won't happen. Gravity will still hold things together locally.


I think he is thinking of ..

http://en.wikipedia.org/wiki/Big_Rip

George


  #22  
Old July 21st 07, 06:45 AM posted to sci.astro.amateur,sci.astro,alt.astronomy,alt.astronomy.solar,uk.sci.astronomy
[email protected]
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Default How long will the sun remain a white dwarf?

On Wed, 18 Jul 2007 14:22:07 GMT, Chris L Peterson
wrote:

On Wed, 18 Jul 2007 13:59:15 GMT, Passing through
wrote:

Hasn't the recent discovery that the Universe's expanse is
accelerating put an upper limit on the lifetime of the Unverse?


Just the opposite. If the observation is correct, it means the Universe
will continue to expand forever.

Or at
least the lifetime before every particle is froced apart from al te
particles?


That won't happen. Gravity will still hold things together locally. All
that will happen is that everything will drift towards absolute zero
(but never quite get there). If baryon decay turns out to be real, the
Universe might ultimately consist of nothing but exotic subatomic
particles, but that question remains open.

_______________________________________________ __

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com


Haven't you heard of the Big Rip Theory? It seems that several
Cosmologists feel that this may be the fate of the Universe. One link
is below.

http://www.space.com/scienceastronom...ip_030306.html

If this theory is true then it does put an upper limit on how long the
Sun will remain in the white dwarf stage. I suspect that if this
theory is true the Sun will have cooled so it no longer appears white.
  #24  
Old July 21st 07, 05:06 PM posted to sci.astro.amateur,sci.astro,alt.astronomy,alt.astronomy.solar,uk.sci.astronomy
[email protected]
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Default How long will the sun remain a white dwarf?

On Sat, 21 Jul 2007 13:47:34 GMT, Chris L Peterson
wrote:

On Sat, 21 Jul 2007 05:45:00 GMT, wrote:

Haven't you heard of the Big Rip Theory? It seems that several
Cosmologists feel that this may be the fate of the Universe. One link
is below.


That's extremely speculative at the moment. Mainstream thought has the
Universe simply cooling forever.


If this theory is true then it does put an upper limit on how long the
Sun will remain in the white dwarf stage. I suspect that if this
theory is true the Sun will have cooled so it no longer appears white.


Depends on what you mean by white. In 20 billion or so years, the Sun
will still be very hot and certainly glowing brightly.

_______________________________________________ __

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com


It seems a logica consequence IF the expansion is accelrating. At
somepoint it should overcome even gravity. Of course who is to say
the accelration will continue forever. I am certain someone will come
up with a new theory in other decade or so.

By white i was referring to the color. I am sure it will still be
bright, but I am thinking it may well be yellowish after 20 billion
years.
 




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