expansion of sun

Feb 7, 2020
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the sun is set to expand and gobble us all up in the future, says one theory ...

which theory is that and what does it say? could it be true? when is it set to happen?

why does the mighty sun have to expand and gobble us up ...?!
 

rod

Oct 22, 2019
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Stellar evolution theory using p-p chain fusion, CNO, and triple alpha process fusion, the physics indicate a star will expand its size and slowly evolve into a red giant star, e.g. the Sun as the star burns its hydrogen. Equations of state (EOS) are developed for this cycle showing density, pressure, and temperature changes and the ideal gas law (PV=NRT) shows the stellar expansion. Stellar evolution theory is used to explain the H-R star diagram plots obtained for various star clusters like main sequence, main sequence turn-off point (e.g. M67) and red giant branch stars.
 
In about 4 billion years the Sun will have used-up its source of power in the core -- fusion of hydrogen to helium. It doesn't turn off, however, like a light switch, but other fusion takes place that will cause the Sun to do what other stars like the Sun do in these advanced-age circumstances -- they swell and become "red giants" and our star will expand to almost today's Earth's orbit. [The Sun will also lose mass so Earth's orbit will move outward but not to any safe place.]
 
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Catastrophe

"There never was a good war, or a bad peace."
the sun is set to expand and gobble us all up in the future, says one theory ...

which theory is that and what does it say? could it be true? when is it set to happen?

why does the mighty sun have to expand and gobble us up ...?!
Apropos of nothing in particular . . . . . . . . . could it be some incredibly ignorant statement, could it be real genius, dunno - could it be stupendous assertion, could it be incipient insanity . . . . . . . . . lets scrap science, lets go back to living in caves - surely anything is better than pursuing improvement of knowledge. Just getting my stone axe and off for dinner . . . . . . . . . that's life!

Good hunting!
 
Mar 19, 2020
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the sun is set to expand and gobble us all up in the future, says one theory ...

which theory is that and what does it say? could it be true? when is it set to happen?

why does the mighty sun have to expand and gobble us up ...?!

For everything you ever wanted to know about what the sun will likely do in the future, see the link below. It should define most issues of the sun's evolution and end result. It covers many interesting features of the expansion of the sun as it burns through the remainder of its hydrogen.

From Ohio State University:



Also, check out this link for what it will ultimately become - a white dwarf (a very unique object to be sure) :

 
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