"Scientists agree the sun will die in approximately 10 billion years"

Did you mean scientists agree the lifespan of our sun is 10 billion years, and that the sun is about halfway through that lifespan?

"A planetary nebula marks the end of 90% of all stars active lives and traces the star's transition from a red giant to a degenerate white dwarf."

This sentence is confusing. If the vast majority of stars are red dwarfs, and none of them are even close to the end of their life, nor do scientists predict they form planetary nebula never mind red giants, how do you explain this line?

"Scientists agree the sun will die in approximately 10 billion years"
This is wrong. Very wrong.
Ptaah: "To be said straight away is that the terrestrial scientists err to a large degree in regard to the Sun's lifespan, because it is a dying star and its real remaining lifetime accordingly amounts to only 1,500,000,000 to 2,500,000,000 years".
https://billymeie...sun-sol/

When our sun dies Thanos will die. But since nobody explained to him how life works, populations throughout the universe would have recovered only a few generations after he decimated them, meaning that by the time the sun dies nobody would know who he was anyways.

The end.

Sequel - what he should have done is kill off half the species. Then evolution would have only replaced them after a few 100,000 years.

Still, nobody would remember him so meh.

"A planetary nebula marks the end of 90% of all stars active lives and traces the star's transition from a red giant to a degenerate white dwarf."

This sentence is confusing. If the vast majority of stars are red dwarfs, and none of them are even close to the end of their life, nor do scientists predict they form planetary nebula never mind red giants, how do you explain this line?

You must be even more dyslexic than I am and I am bad enough and I am nearly always misreading things!
That line refers to "red giant" and "white dwarf", NOT "red dwarf", which is not to be confused with either.

"Scientists agree the sun will die in approximately 10 billion years"

Did you mean scientists agree the lifespan of our sun is 10 billion years, and that the sun is about halfway through that lifespan?

I agree that part is very unclear. They shouldn't use the word "die" because in this context the meaning of "die" is totally unclear. "transformed" might be a better word?

Similarity of stellar nebulae to atom orbitals points to the AdS/CFT correspondence. See also Pilot wave analogy of dark matter could explain our Solar System's 'random' patterns

I see some similarity in atomic orbitals and stellar nebulae but they are still very different: https://en.wikipe...ls_table

It's like asterism and naming star formations after animals because they look the "same". I like the thought that micro and macro worlds would really be the same. Like our solar system or our galaxy would be an atom and our visible universe would be somekind of molecule. I've spend numerous hours wondering this stuff and its implications but it does not make it true.

To the topic: I wonder how sure they really are about the age of sun and how are they so sure about the lifetime of stars?

"What happens when our Sun dies?"

Well, nothing! That's how you know it dead. Unless, over the next few hundred billion years, the stub remnant of Sun gets recycled. Like your beer cans?

I've spend numerous hours wondering this stuff and its implications but it does not make it true.

Of course it also doesn't make it less relevant. In another words, your comment is unsupported by anything, subjective and useless...

Why start calling names? Your comment was not any better. At least I wrote something that was on the topic.