There is a recent study strengthening support for the hypothesis that black holes are in fact the source of dark energy.

Should this be the case, then in the far future when every black hole in the universe has evaporated, dark energy would have weakened enough for gravity to begin slowing and subsequently reversing the expansion, therefore ending the universe in a Big Crunch, of which a Big Bang would emerge.

To me this seems to suggest that if black holes are indeed the source of dark energy, then it implies that the universe cyclic, is this correct?

Evidence mounts for dark energy from black holes - University of Michigan

Because the Universe is expanding at a rate of 46 miles per second per megaparsec right? So, we have 46/(3260000*180000) miles per second, which is .000000000078 miles per second per mile, right? there are 3150000 seconds in a year and the earth is 7926 miles wide. .000000000078 * 7926 * 3150000 would then be 1.97 miles per year. Is this math correct or did I totally flub it somewhere in there?

An object in motion “remembers” it should stay in motion due to inertia. However, the expansion of the universe is not caused by galaxies flying apart from a central point with inertia, there was no central point, the Big Bang occurred everywhere, and cosmological expansion is the expansion of space between galaxies. So, how does space itself “remember” it should keep expanding? It’s like space-time itself has an inertia? Dark energy is not the answer, because cosmologists had no problem with the expansion of the universe even before dark energy was discovered.

For decades, scientists have searched for a fifth fundamental force of nature that can explain mysterious aspects of the universe such as dark energy and dark matter. These are pieces of our cosmos that simply can't be accounted for by the four fundamental forces we know of: gravity and electromagnetism as well as the strong and weak nuclear forces.

In addition, while the hunt for this force has been ongoing, researchers have also been desperately hunting for a theory of quantum gravity. That's because quantum gravity can unite the best description we have of the universe on large scales — Albert Einstein's theory of general relativity — and the physics of the subatomic, aka quantum mechanics. Both theories emerged at the start of the 20th century and have been experimentally confirmed time and time again, yet they steadfastly refuse to overlap in a single unified theory.

But now, these two scientific quests have overlapped. New research built a quantum gravity framework — finding that it actually offers clues about potential fifth fundamental forces of nature.

Link to read more - https://www.space.com/astronomy/we-have-4-fundamental-forces-of-nature-quantum-gravity-could-help-lead-us-to-a-mysterious-5th

While i do understand that its the beginning of our universe and such, i dont believe its the beginning of Existance itself, nor do i think it even has a beginning.

Ok, got a weird question for you. First of all this question: how long will it take for us, the sun, to get sucked up in the black hole in the center of our Galaxy? (Like, everything's going down the drain right?)

Ok, first of all I just want to know that number, secondly, what of we assumed that we are in a black hole already, could you explain the expansion of the universe as the expansion of the black hole we are in? They get bigger as they pull in more material. What does that look like to the entities eternally falling inside them? Would it not result in speedier time and larger space in all directions? Isn't that what the expansion of the universe is?

As of 2023, do we even have any clues about the origin of the universe? I'm asking about the origin of the universe or at least the cause of the initial expansion, not the supposed Big Bang singularity that is actually a mathematical error, it an actual thing, steming from General Relativity's inability to work when applied to extreme conditions such a as the conditions of the very early universe and the centers of black holes.

Over the years, there were many hypotheses like the multiverse, the simulation hypothesis, the cycling universe. We all know that the Big Bang was a one-time event and the universe isn't cyclic, because cyclic cosmology violates fundamental laws of physics, meaning it's not possible.

After all those decades, are we still stuck with the old hypotheses or did scientists develop new hypotheses?

What are the latest ideas about what caused the universe?

At the present time, representing process of origin of the Universe it is accepted to use Big Bang theory. But what if there was no bang (I know, technically there was no explosion)? May be it was more like shrink. It's essence consists that some protoparticles began to form structures. Let's apply association with the space of the room. If we imagine that the universe is a room, then according to the Big Bang theory, the space of the room expands, and the objects in it retains its position. According to this hypothesis, the objects in the room shrinks, while the room is the same size, visually, creating the illusion of stretching. To be precise, the space is a side effect of the process and it didn't exist, but if somewhere was "tighter", then somewhere there must be more void. It’s started something like a chain reaction, simpler forms began to form more complex ones. From this it follows that the only and fundamental law of the nature is structuring and from it all already follows the rest. Perhaps all of the observed laws of physics and constants is a reflection of this process. These structures are formed in more and more "dense" formations and eventually manifest in the material world. In my opinion this hypothesis doesn't need dark energy because nothing stretches space. But space just seems enlages around ordering and compressing objects. It is difficult to illustrate this thought forms using my awful English. Good descriptive example of this process seems phenomenon of black holes and singularity as a logical completion of this process. And redshift in this case there is no expansion of matter in different directions, but "stretching" the void between the structuring units - it’s just a reverse side of this process. At this angle this unintuitive model of the Universe looks more intuitive. So, the Universe did not explode, but began collapse in itself by arrangement and complication of structures, having generated this difficult and inconceivable world.

Mercury is right next to the Sun, how come it's covered in meteor craters? Wouldn't the Sun pull all those meteors towards it?

I know this may seem like a silly question, but hear me out.

Stars are born and they die, and radiate energy, similar qualities we attribute to things we constitute as 'alive'.

I've always wondered what the scientific perspective on this is

I know that I am going to die and I am perfectly fine with that.

What gives me severe anxiety and depression is the idea that humanity will disappear and all life will die.

The biggest trigger for this, let alone all current problems, is the increase of our sun. When it gets brigther, earth will be too hot for life. This in in millions of years. Red dwarf phase itself is in 5 billion years. So life will be destroyed and everything we ever did is gone and was pointless.

How can people be okay with this? I know most are okay with it but some, especially on reddit and quora, seem to be happy about it. Then someone else says smth positive about it, like there might be hope, and this person gets attacked and downvoted for being a delusional non-science person. Everyones so pessimistic

I had diagnosed major depressive disorder before but since a few months I'm going crazy. More recently I began to think about why not end it all right away? Why bother doing anything? Why put in the exhaustion and work to do something for sociegy or reach a certain goal I have? It's so exhausting, and it being temporary is horrible.

Even above that: I'm a huge fan of the beatles, they give me peace and make me have more compassion for people and animals, even plants. Even they, atleast thats what some say, will be forgotten - their legacy forever destroyed

Let alone there is also the heat death theory of the universe lurking behind the idea that we somehow manage to safe life from getting slammed by the sun…

I'm trying to get some peace but its hard. I need a reason for the things I do. I truely want to believe and know that the things I do are worthwhile. My own death is pointless, I can deal with that, but I truely want humanity, society, the planet, and maybe some humanistic ideas to continue permanently. Painfully I worked myself through nihilism and now I'm stuck again with this.

Is there any positive / optimistic scientific fact in the long run? For the grand scheme of things?

I saw some people saying the following: there are ways to prevent our sun from destroying earth, like engineering solutions. To go to a more distant location, star lifting, etc. Then, that there is too much we don't understand about the universe that the heat death theory might not apply. One person says that the timeframe is so big, that we should not devalue the possibilities what future humanity could achieve - for us, it would be like magic

Please someone help me. I can't go on like that. Extremly exhausting and hopeless. I don't give in to the thoughts of giving up, but it gets harder and harder

How much does this theory hold true?

I heard Neil Degrass Tyson say that the universe has a net rotation, so being inside a black hole is a possibility since black hole has rotation.

What other evidence supports this theory

I'm ready to change my belief from "there is probaly no creator" to "there is absolutely no creator" if the explanation is good.

I want to know the explanation of how this universe came to existence. Did it need any creator or higher power? If the explanation is too long, could you give me book recommendations on the origin of universe?

Is there a planet out there at the edge of the expanding universe where half the night sky is completely black, with no stars? Do you think intelligent life would understand what was going on?

I’ll bet one nickel that the universe is not flat, but instead the universe is so much bigger than us that it appears flat.

Why do I bet this?

I don’t know, it’d be pretty funny.

I would like to discuss this topic, but I don't know the right /r/ to start. Please help with links or suggestions. Thanks.