What is the universe?

Question

Space

Is this what is formed after the big bang?
Then what is the name of the space around the universe?
Ether? But since something exists in this space, for example, the universe, then it is not exactly ether?

What shape is the universe?
If the expansion goes in all directions, then spherical?
There is an opinion that the expansion goes only in one direction.
Then what form is it?
How far can you see it in its entirety?

Apart from the expansion, are there other movements observed?
Is the universe itself inert or in motion?
If in motion, then in relation to what coordinates does it move and at what speed?

Is the universe alone?
If there was one explosion, could there have been others, in other "places"?
What if two or more universes collide during expansion / movement?

Answer 1

The Universe is a four-dimensional (at least) object with a space-time metric.
The Big Bang is the earliest point in the Universe. “Before it” nothing could exist anywhere, therefore earlier points of space-time do not exist.
Probably, the Universe is infinite and “flat”, i.e. its geometry is Euclidean - with good accuracy. It is more or less uniformly filled with matter (on the scale of metagalaxies, i.e. hundreds of megaparsecs), and its mass is infinite.
Whether the space-time of the Universe is embedded in some space of higher dimension is unknown. There is a "membrane" theory that suggests yes. But it is better to assume that no (s).
It is impossible to talk about "space around the Universe" - it fills the entire space. The expansion does not occur due to movement - the distance between the points simply increases (they usually give an example of an inflating balloon, but it must be taken into account that there is nothing besides the surface of this ball - and all points of this surface are motionless). So the question "in which direction it expands" does not make sense either. It just expands.
There are other moves. For example, the local group of galaxies moves relative to the background radiation at a speed of 300 (or 600?) km/sec. Whether there is a “more inert” frame of reference than the cosmic microwave background is still unknown.
In its space-time, the Universe is alone, and there is no one to collide with. Other Universes are not informationally connected with ours. “White holes” that could serve as “exits” of portals between Universes have not yet been discovered, and what is on the other side of black holes is also unknown. It is only known that it is in the infinitely distant (by our clock) future.
In membrane theory, universes can collide. Perhaps, as a result of such collisions, events that are visible as a “big bang” occur. But this needs to be studied in more detail.

Answer 2

Of course, I am infinitely far from astrology, I will insert my 5 kopecks of logic and reflection, since I have nothing more. Since you ask such questions, it means that you didn’t have enough Wikipedia, so I think it’s okay if I say something completely different from what is written there.
>>Universe one?
The universe is not such a tangible and measurable concept as, say, a galaxy. This is the word that we call everything together that the mind is able to realize, accordingly, of course, it is one - as soon as we learn something new, something that was much further than we knew before, our perception of the size of the universe will increase, but the universes will not become 2.
>> What is the shape of the universe?
Since we cannot measure the size or shape of the universe, I propose to judge the shape of the universe by the maximum diameter of the visibility of our space exploration systems, that is, for us it will always be spherical
>> There is an opinion that the expansion goes only in one direction.
There is an opinion that infinity cannot expand, it is unnatural for infinity. Only our horizons are expanding, and it is expanding in all directions
. As for the ether ... You see, since the word "Universe" we call the whole world that we see and about which we only guess, then we stumble upon something new, even some kind of border , we would simply give it a name as some kind of astronomical phenomenon, assuming that behind it is a continuation of the universe, and the border itself is also part of it.
According to the big bang, as I understand it, scientists have much more specifics, but I would like to leave my thoughts here. In theory, the BZ could not be where there was nothing, the energy that was released during it came from somewhere from some material or source, and the BZ itself occurred in the universe, and thus scattered galaxies, matagallaxies over it, and can something else that scientists have not reached for or have not come up with a name for. Before him, there was already a space that BZ filled with matter, and this space fits into the model of what we call the universe.
Forgive me if I offended the hearing of some astrologer :)

Answer 3

I would be surprised if I saw opposite the question "there is a solution"))

Answer 4

You ask such questions… =) It's like asking a caveman whether there are other planets like the Earth.
My understanding: the speech about space and time in our understanding makes sense to be only within the framework of our universe, which is the result of a big bang.
So questions about side view/movement are very specific.
As for the form, again it is difficult to give a clear answer. In a rough sense, it is like a sphere, but on the scale of the entire universe, gravitational non-Euclideanism can throw out its tricks.
To the rest of the questions, as far as I understand, modern science does not give an answer. There are hypotheses, but not everything is going smoothly with verification.

Answer 5

“Is this what forms after the big bang?”
— Yes, outside our Universe there is something else with its own laws.
“Then what is the space around the universe called?”
- It's not called at all. Nothing is known about him and never will be known.
"Ether? But since something exists in this space, for example, the universe, then it is not exactly ether?
This is a medieval show. There is something else with its own laws of physics.
"What shape is the universe?"
- Ball.
"If the expansion goes in all directions, then spherical?"
Yes, spherical.
“There is an opinion that the expansion goes only in one direction.”
— No, it contradicts Young's law of wave propagation.
"Then what shape is it?"
- Ball.
“From what distance can you see it in its entirety?”
- Depending on your angle of view. And to be honest, you will never be able to leave our Universe.
“Apart from expansion, are there other movements observed?”
— Compression of matter inside our Universe.
"Is the universe itself inert or in motion?"
“We will never know. See Newton's First Law.
“If in motion, then in relation to what coordinates does it move and at what speed?”
- Unknown.
Is the universe alone?
If there was one explosion, could there have been others, in other "places"?
What if two or more universes collide during expansion / movement?

Answer 6

minus gentlemen, I understand you perfectly,
there are so many important things around that we care about this universe.
and so you are doing your important fuss instead of minus :)
thanks

Answer 7

Figase question)
The universe is everything that is around.

Answer 8

What, however, is inhuman mmm ... ignorance in the answers, except for the last three, it seems that people mostly graduated from institutes

Answer 9

Sorry, reminded me .
Seriously,
is this what forms after the big bang?
Then what is the name of the space around the universe?
The Universe is an object with thermodynamic characteristics that contains our galaxy. There is generally no space around the universe. For the universe, the word around is inapplicable for the same reason. But if there is you, we don't know anything about it.
What shape is the universe?
If the expansion goes in all directions, then spherical?
Yep, spherical.
There is an opinion that the expansion goes only in one direction.
Then what form is it?
Vraki.
How far can you see it in its entirety?
We have already said that we do not know whether there is space outside the universe, so the word distance is not applicable there.
But if suddenly there is - then FIG knows how.
Apart from the expansion, are there other movements observed?
Is the universe itself inert or in motion?
If in motion, then in relation to what coordinates does it move and at what speed?
Is the universe alone?
If there was one explosion, could there have been others, in other "places"?
What if two or more universes collide during expansion / movement?
Twenty-five again - see the previous question. We do not consider the universe as an object that has any characteristics in relation to other objects outside of it, because we do not know such.

Answer 10

Wow, a lot has been written! There are no answers to all questions, but for their formulation and deeper understanding, it is important to know the limits of modern science. In particular, you need to know that from a certain density of the “substance” formed by the big bang, it is impossible to operate with traditional physical quantities, such as time. It seems to be always and everywhere, but Planck time exists . In this short period, all fundamental interactions were unified, then the gravitational one separated and began ...

Answer 11

the universe is such a region of space in which all matter is located (energy is associated with matter).
There is emptiness around the Universe, nothing (according to modern concepts, it may be clarified in the future).
The universe has no form. Well, gas has no shape, and it doesn't bother you?
The expansion goes in all directions, but firstly, it is possible that it is uneven at large distances. And secondly, what about the initial conditions and changes in the process? The Universe is not a ball and never was after the Big Bang.
How far can you see it in its entirety? Weird question. In the same way as with ordinary large objects - move away.
Other moves? What are these, for example? Unclear.
The universe itself is inert or in motion: not in motion. For movement, there must be a binding to something. It is impossible to get attached in the void.
Is the universe alone? This is unknown to science. Many physicists think not. I don't know.
If there was one explosion, could there have been others, in other "places"? Well, if we assume that there were other singularities, then there could be. There is currently no evidence that our universe has ever collided with another.

Answer 12

The answers are awesome!
A few hundred years ago, the answers would have sounded like this:
the universe is the earthly firmament standing on elephants, whales, etc. definitely!
Knowledge has expanded since then, but to say exactly how many universes, whether they exist, whether they can collide, etc. I would be careful, perhaps over time we (rather our descendants) will find new and unexpected discoveries.
Well, as for today's performances, I advise you to find a book published about a year in 1985-1987 called "How the Universe Exploded". It describes facts, calculations and hypotheses of the origin of universes that are relevant to this day. There are answers to many questions.
Just get ready to strain your brain properly, since the laws that operate in the microcosm and on the scale of the universe are very different from those ideas that we are used to in the macrocosm - in our ordinary life.