Brenda Ann wrote:

On Apr 23, 1:17 pm, 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