Re: ( OT) Global Warming, a primer . .

Brenda Ann wrote:

On Apr 23, 1:17 pm, cuhu...@xxxxxxxxx wrote:

If y'all think Earth is warm now,,, stick around for about four and a
half billion more years.It will be the end times,I tell you,it will be
the end of everything.
cuhulin


I think that the 4.5 billion years may be quite an overestimate. I've read more conservative estimates of 1 to 1.5 billion years before the sun goes nova (Solar system warming?) I suspect that mankind will be long extinct by that time, or gone from the spent planet.

The sun doesn't have enough mass to go through the nova stage at the end of it's life. When it runs out of fuel for nuclear fusion, the sun will slowly expand to a red giant which dissipates into the solar system, leaving behind a white dwarf star. This star shines from residual heat instead of fusion. It has a much longer life span than the original star (sun). The white dwarf eventually becomes a black dwarf which emits radio waves instead of light but the universe is not old enough yet for black dwarf stars to exist.

http://hea-www.harvard.edu/scied/SUN/sunpage.html

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

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

Relevant Pages

  • Re: ( OT) Global Warming, a primer . .
    ... The sun doesn't have enough mass to go through the nova stage at the end ... leaving behind a white dwarf star. ... The white dwarf eventually becomes a black dwarf which emits radio ...
    (rec.radio.shortwave)
  • Re: ( OT) Global Warming, a primer . .
    ... I've read more conservative estimates of 1 to 1.5 billion years before the sun goes nova I suspect that mankind will be long extinct by that time, or gone from the spent planet. ... When it runs out of fuel for nuclear fusion, the sun will slowly expand to a red giant which dissipates into the solar system, leaving behind a white dwarf star. ...
    (rec.radio.shortwave)
  • Re: ( OT) Global Warming, a primer . .
    ... When it runs out of fuel for nuclear fusion, the sun will ... leaving behind a white dwarf star. ... It has a much longer life span than the original star ... The white dwarf eventually becomes a black dwarf which emits radio ...
    (rec.radio.shortwave)
  • Re: the end of our sun-white dwarf or red giant?
    ... The Sun isn't massive enough to form a neutron star. ... giant stage, then a white dwarf. ... our sun would turn into a white dwarf after death. ...
    (sci.astro)
  • Re: When a star become a dwarf
    ... What does a planet become when the star that is nearby (i.e Sun for the ... Well technically the Sun is already a dwarf. ... A star becomes a white dwarf after having passed through the red giant ... The inner planets Mercury and Venus will be engulfed by the Sun's ...
    (sci.astro)