Could there be other universes out there? if so, then could there be dead universes?

Question

i have a therie. i believe that there may be a large number of other universes out there, and that some of them are "dead" i get this idea because stars use massive amounts of hydrogen and make heliem. i'm not sure whether or not other things in space can make more of it but if not... then what happens if we run out of hydrogen? what if theres no more hydrogen left... could that make the universe technicly dead?

Answer 1

could be, time and technology will tell.

Answer 2

Yes i have wondered the same thing. In my opinion is is 100% possible for other universes to exist but i dont think one can actuallty 'die'

Answer 3

if their would be a dead universe what about its planets and the sun they dead too ?

Answer 4

its hard to explain and i think yes thrs other universes and yes our universe will one day die/not day but watever.

Answer 5

The universe is approaching something called the "heat death" according to current data, which means that as the universe expands -- and accelerates as it expands -- there won't be any renewable sources of free energy and the Second Law of Thermodynamics will drive the universe inexorably to the lowest energy state.

However, even in such a scenario, something on the scale of the universe (give infinite time) will randomly free up some energy, just like an enclosed box with a heated gas in equilibrium will at times have random sections that through sheer chance have local decreases in entropy. Something like that could happen on a large scale, so if something like a Big Rip never occurs (as it's not known whether it's a valid concept or not) then the universe won't ever truly be "dead," considering the First Law of Thermodynamics suggests that energy can't be created or destroyed (and would thus always be capable of decreasing entropy locally through sheer statistics).

It's possible that there are other universes, yes, and that some of them are "dead" in some sense -- depending on how you define "dead." As far as we know the constants that define our universe can be different in other ones, and if a few of those constants are off by even a little you'll end up with a universe that's utterly uninhabitable by any sort of life.

It's possible that our local section of the universe could end up that way if we're living in a false vacuum. Nature tends to use a concept of "least effort," and any given vacuum state is higher or lower in terms of energy than others. If the vacuum state that we observe in the universe isn't the lowest possible one then it's inevitable that sheer coincidental quantum fluctuations would reduce to a lower vacuum, which would be extremely bad for any life and physics as we know it.

It's difficult to get into what false vacuums are on a youtube answers format, so feel free to wiki the matter if you're curious about it.

Answer 6

The concept of the Multiverse (A universe of universes) was developed to answer the "fine-tuning" problem of our universe. Basically, the laws of physics appear to be very finely tuned, so much so that, were they different, life could not arise in our universe.

The multiverse implies that, just as Earth is but one planet of a countless number, our universe is but one of many. Just as you have planets that are devoid of life, you would also have universes where the laws of physics do not facilitate the evolution of advanced life.

Your other point about stars using up their fuel is correct. Although it will take trillions of years (approximately 100 trillion), eventually all the hydrogen will be used up and all other available matter will be locked up in white dwarfs, neutron stars and black holes.

In the very distant future, all the stars will die off and there will be nothing but black holes. And even they will eventually radiate into nothing. So yes, you could say that the universe will then be dead.

Answer 7

There could be other universes, empty space, or something we can't imagine at our present level of knowledge.  If there are other universes, some of them may be dead.

Stars are born in nebulae. Huge clouds of dust and gas collapse under gravitational forces, forming protostars. These young stars undergo further collapse, forming main sequence stars.

Stars expand as they grow old. They "burn" hydrogen first.  As the core runs out of hydrogen, and begins to use helium, the core contacts and the outer layers expand, cool, and become less bright. This is a red giant or a red super giant (depending on the initial mass of the star). It will eventually collapse and explode. Its fate is determined by the original mass of the star; it will become either a black dwarf, neutron star, or black hole.

Once all the stars burned out, assuming that new stars had, for some reason, ceased to form, the universe would be dead.

Answer 8

yes there are. but i think it would not die

Answer 9

A number of behaviours of subatomic particles can be explained with a multiple-universe hypothesis, but this account may not be true at all. But if it turns out to be true then also another universe parallel to ours needs not be trillions of light years away, rather it can be as close as a tiny fraction of a nanometre from us. Physicists speculate that the very laws governing these parallel worlds in the hypothetical multiverse can actually differ from one another.

And your concept of a dead universe is, very probably, wrong. A universe can technically be called "dead" if it reached the point of the big crunch or the big rip. The former would give birth to a brand new universe while the later does not.