Timeline question

[Orleander]

When will our sun die?
When will our galaxy die?
When will the universe die?

Can a galaxy and a universe die?

[Dinosaur]

In about 5 billion years, Sol will become a Red Giant and then a White Dwarf. Neither of these stages in stellar life will support life as we know it on Earth. If humans survive that long, they will have to move from Earth or live at least a hundred or more miles below the surface.

I think Sol will last perhaps 25-50 billion years before becoming a dead cinder. This is a WAG, not even a SWAG.

In about 100 trillion years the last star will burn out & become a dead cinder (SciAm March 2008). I suppose that this is the death of the last star and the death of the galaxy containing it.

A search for “Main sequence” or “Stellar evolution” or “Stellar Life cycle” will find some data on how long Sol will last.

The March 2008 issue of SciAm has an article titled “The End of Cosomolgy.” It indicates that in about 100 billion years, the local galaxies witll combine into one large galaxy. All other galaxies will be beyond our observable universe. Astronomers will have no clue relating to the Big Bang & the expanding universe we now see. With a knowledge of fusion reactions, they will be able to estimate the age of their island universe by considering the abundance of hydrogen, helium & other elements in stars.

Cosmology will be similar to that of the late 19th & early 20th centuries: A single galaxy in a void of unknown extent.

[quantum_wave]

Excellent answer Dinosaur. Here is a link to the big rip (http://en.wikipedia.org/wiki/Big_Rip) theory.

It is possible that there will be no big rip if the universe has a way to regenerate useful energy from the cinders of burned out stars and galaxies. For example if our known universe is not alone and if there is an infinite greater univesre containing a potentially infinite number of separate temporary expanding and contracting arenas then a scenario of a perpetual arena process of energy-to matter-to energy could easily be developed.

[skaught]

When will our sun die?

Insufficient data at this time to provide a meaningful answer.


When will our galaxy die?

Insufficient data at this time to provide a meaningful answer.


When will the universe die?

Insufficient data at this time to provide a meaningful answer.


Can a galaxy and a universe die?
Insufficient data at this time to provide a meaningful answer.

[D H]

According to plate tectonics, subduction keeps the sun a constant size so the sun will never die.
Reported as trolling.

I know this forum loves and cherishes crackpots, but this guy is over the top with his logical fallacies, outright lies, and trolling. If enough of you report this garbage perhaps the mods will do something about him.

[skaught]

According to plate tectonics, subduction keeps the sun a constant size so the sun will never die.

:bugeye: 'eh?

[Saxion]

When will our sun die?
When will our galaxy die?
When will the universe die?

Can a galaxy and a universe die?

Orleander;

I will provide my imput.

Our Sun is estimated to live for another 6 billion years, in which is will exhaust its fuel by nuclear runnaway. By this event, it will expand around 200 times larger into what is called a Red Giant, and then slowly collapse into a black dwarf.

Our Galaxy, the Milky Way has something like 200 billion stars, being 100,000 lightyears across and 10,000 lightyears thick - and in about 10^{19} years, it is expected that the center of our galaxy will collapse into a black hole, and after bout 10^{20} years, our galaxy will decay through gravitational radiation.

Our galaxy is one of an estimated 50 billion in the universe, where some galaxies have grouped with 12 other galaxies, whereas others have grouped in thousands... and in around 10^{1500} years, it is expected that all of these star systems will have fused or fission together to form iron by radioactive properties. Ultimately, it may take about 60 billion billion billion years for the universe to undergo a collapse, in which everything is shoved back into the gravitational singularity whence everything had came.

It may not undergo a collapse however, and may continue to expand for even longer, until the fabric of spacetime itself is stretched to such an extent, the fabric itself will rip. This rip would certainly cause the end of the universe.

[Saxion]

If you have any more questions, astrological events are one of my pet favourites.

[cosmictraveler]

Everything will cease to exist whenever you die. Nothing can ever exist after you are dead that you could ever prove.

[Saxion]

Thast depends, on extentialism or subjectivism.

[rpenner]

I will provide my imput.
Which sources or original calculations did you use to support any of these numbers?

Currently, at the center of the Milky Way, there is a black hole of several million solar masses (http://en.wikipedia.org/wiki/Sagittarius_A*). So in one sense, the center of the Milky Way has already collapsed into a black hole. Also, the death of the Galaxy in ambiguous in light of the possible collision and/or merger with Andromeda.

http://en.wikipedia.org/wiki/Andromeda-Milky_Way_collision

[cosmictraveler]

Thast depends, on extentialism or subjectivism.

Not at all. When your dead there's actually no way to know if anything exists. If you can show scientific proof that there is a way to determine things exist after you die , please provide a link tio the article.

[Orleander]

Not at all. When your dead there's actually no way to know if anything exists. If you can show scientific proof that there is a way to determine things exist after you die , please provide a link tio the article.

What? That's just stupid. You want proof that people keep on living after you die? That's flat out dumb.
Go start your own thread about how everything ends when you die.

[Orleander]

...It may not undergo a collapse however, and may continue to expand for even longer, until the fabric of spacetime itself is stretched to such an extent, the fabric itself will rip. This rip would certainly cause the end of the universe.

why is it considered fabric? Does air rip? And wouldn't stars continue to be born filling in the emptier region of space?

[Dinosaur]

I do not really care, but I am curious.

There was a post by OilIsMastery and a comment by me (I was a bit nasty).

Neither post is here now.

When posts are removed I think there should be an explanation.

[Saxion]

Which sources or original calculations did you use to support any of these numbers?

Currently, at the center of the Milky Way, there is a black hole of several million solar masses (http://en.wikipedia.org/wiki/Sagittarius_A*). So in one sense, the center of the Milky Way has already collapsed into a black hole. Also, the death of the Galaxy in ambiguous in light of the possible collision and/or merger with Andromeda.

http://en.wikipedia.org/wiki/Andromeda-Milky_Way_collision

Oh, there are black holes. But the center of the galaxy will collapse into a larger black hole given enough time. Black holes merge, as i am sure you know.

Source? That's like asking me what i did last week, and where i bought my packet of cigerettes... and i would fail miserably :)

[Saxion]

why is it considered fabric? Does air rip? And wouldn't stars continue to be born filling in the emptier region of space?


Theoretically, stars are born from dense gas clouds through a process called accretion.

. A very slow process called accretion had to formulate the first known planets and stars... this happens when an accretion disk of cloud of gaseous materials contracts under the extreme forces of gravity, and the natural combining of atom to atom, creating stable structures of molecules and families of molecules.

Spinning masses forms a disc with a center construct which would be warm as a protostar undertakes a ''gestation period''. Eventually the central region of this locality inexorably collapses under the hostile force of gravity and gravitational waves, and allows the centre to continuously heat, possibly doubling every epoch, as the ambient gases continued to gather toward its central core. The protostar would dispense and radiate much of its heat and energy, ejecting matter outward, where the disc itself offers little restraining to this process. The matter that is ejected is actually contributing to the debris of the surrounding disk, carbons and heavy materials helping to form the very early solar-system.

Nuclear fusion is beginning at the stars core, and the star begins its core. The birth of the star was completed... A very steady balance in the elements needed to make all of this possible can only be seen in light of some fine-tuning. Planets develop when matter around the central star forms small pellets which collide violently, making even larger celestial bodies, we call ''Planetoids''. Any excess debris not falling into the planetoids formations contribute very slowly to the creation of moons and asteroids.

As for the other question, spacetime is a bit like a fabric. It stretches as it expands, and if it expands too much, gravitational and electromagnetical signals cannot reach enough space in enough time, and signals therefore rip the fabric, because the fabric itself is a physical vacuum. You cannot have spacetime without matter, and vice versa.

[Saxion]

Any more questions, just ask.

[StrangerInAStrangeLa]

When will our sun die?
When will our galaxy die?
When will the universe die?

Can a galaxy and a universe die?

No 1 knows.
No 1 knows.
No 1 knows.

No 1 knows.

[Saxion]

Wrong. x 4

[StrangerInAStrangeLa]

Wrong. x 4

Coming up with the best theories we can is good but there is no way we can know those things.
You & many others will go on&on fooling yourselves & others but you are wrong.
Sometimes I can see why theists claim faith is involved in science.

[Harro]

Not at all. When your dead there's actually no way to know if anything exists. If you can show scientific proof that there is a way to determine things exist after you die , please provide a link tio the article.

I dont have a link to an article but I can provide you with evidence myself that things can exists after you die.

1.Q. when some one you know died (maybe a friend or family member) did you stop existing?
A. No.... that is evidence that everything exists after they die.

2.Q. When some one dies what happends to there body.
A. the matter and energy from a dead body still exists, this is proof everything doesnt go poof and vanish into nothingness. Usually most of it is recycled by other living organisms to sustain its own life, some of that matter and energy will also breakdown into the environment.

3.Q. Before you where born did anything exist
A. Yes... your parents had to exist to give birth to you.

4.Q. When all conscious matter dies (matter that knows it exists, like humans) will anything exist.
A. Yes...Evidence from the first 3 question implies that everything still exists before and after any life existed.

Im not sure your aware of this but conscious matter (i.e. Humans) are fundamentally no different from the rest of the universe. I will try to explain, you are made of matter and energy the same stuff the universe is made of. The only difference is its structure and arangement. Your matter and energy was made by the universe and back to the universe it shall return in some form or another.

[quantum_wave]

I like to think that not knowing when you are dead is the same as living forever :D.