Is the universe a balloon? Why is the universe spherical?

Think of it like a balloon. However, the universe is different from ordinary balloons.

Because when the balloon is blown up, it will form convex places in some places and concave places due to uneven surfaces. Even if it is a good quality balloon, the balloon mouth has the least inflatation.

The expansion of the universe (assuming that the universe is produced by the singularity of the big **), is a relatively uniform expansion, although there is no point that is the center of the expansion of the universe, but I think that the points of the universe are the center of the expansion of the universe, and the singularity of the big squeeze and the singularity of the big ** are the same point.

Now almost everyone assumes that the universe is generated by the big **, but in fact, if we take into account the quantum, we will find that the big ** points do not exist.

Quantum mechanics is a great study, but Einstein was very disapproving of the introduction of quantum mechanics into physics. His emotions can be used in his quotes"God doesn't roll dice"to explain. (Quantum mechanics predicts different outcomes that may occur in each set of observations, and tells us the probability of the outcome occurring.)

For example, in a set of measurements, there are two kinds of measurement results, A and B, A occurs a certain number of times, and B appears another different number of times, and one can predict the approximate value of A or B, but cannot make predictions about the specific results of individual measurements, so quantum mechanics introduces the inevitable factor of foresight or randomness into science. )

The above is my personal opinion, and I ask for your bearing if there are mistakes.

In fact, Hawking's original words are that the expansion of the universe is like the expansion of a balloon, although the whole is expanding, but there is no point at the center of its expansion.

However, in general, it cannot be said to be a balloon if it can be regarded as a balloon.

The universe is certainly not a balloon, and that is beyond reproach. But we can think of the universe as a balloon, and they have similarities. The universe is finite and unbounded, this is like a balloon, we are inside the balloon, the balloon space is limited, but in it, we can never go to the boundary, just like walking on the surface of the earth can never reach the edge.

We can't find the center of the universe because we haven't detected the extent of the universe. That's right, the balloon inflation occupies a larger space, there is no space outside the universe, it is nothingness, why can't we replace the balloon expansion space with nothingness?

No, although the universe is expanding, it cannot be seen as a balloon expanding, because the balloon expansion is expanding in a larger space, but the universe has no "outside", that is, there is no space outside the universe. The expansion of the universe is hard to imagine, and imagining it as a balloon is just a figurative metaphor. In addition, there are many theories about the origin of the universe, and the big ** is just a more convincing one, but no one says that he must be right.

The general relativity language model of the universe looks like this: for example, the universe starts at the North Pole, then expands like the surface of the Earth, begins to shrink at the equator, and finally ends at the South Pole.

The latest theories suggest that the shape of the universe is a straight space, not a so-called closed spherical space, nor an open hyperbolic space.

The comparison of the universe to a balloon is just to argue that the universe started with a big ** and has been expanding.

No, it clearly tells you that the universe can only be described as infinite, although it is difficult to imagine, but it is necessary to remember that a kilometer outside the universe is still a universe, so it has no boundaries and shapes.

Not quite right. The universe contains so many things.

Because it's inflating, it feels like a balloon, but it's actually like a balloon, but it's not inflated, it's shrinking.

As long as there is an exploration of the mysteries of the spiritual universe, you will be revealed.

This is a metaphor, a metaphor so that ordinary people can understand what time is.

is an infinite big balloon.

The universe is not spherical, and its geometry remains an unsolved problem. The study of the spatial geometry of the universe is still ongoing, and there are several possible shape hypotheses.

1.Flat space: According to the grand theory and the expansion model of the universe, the space of the universe may be flat. In flat space, the geometry of the universe resembles a plane in Euclidean geometry.

2.Closed space: Another possibility is that the space of the universe is closed, with spherical or spherical geometry. In an enclosed space, the line and object return to the origin along the surface.

3.Open space: It is also possible that the space of the universe is open, with a curved shape that is more than three-dimensional, such as hyperboloids. The geometry of the open space is not spherical, but presents curvature.

At present, there are still many unsolved mysteries about the true geometry of the universe, because we still have a limited understanding of the vast majority of the universe. Scientists try to determine the geometry of the universe through observations and experimental evidence, including by detecting the cosmic microwave background radiation and observing the large-scale structure of the universe. As technology continues to advance and more data is collected, we may have a deeper understanding of the geometry of the universe.

First of all, you think about a ball and a saddle.

The ball is the positive curvature you can imagine, and the saddle is the negative curvature.

Suppose, this is our earth, suppose the earth is a perfect circle, because it is convenient for you to understand, you and I are now at the North Pole, looking at the equator of the earth type, half of the equator is equal to any meridian, then the area contained in this circle is the northern hemisphere.

And by doubling the radius, we get a surface area of the Earth. At this time, the area is only increased by 1 times, not by 4 times the number on the plane.

You can also imagine a saddle where the lowest point in the middle of the saddle, in which a radius is to contain a larger area than the plane, and people think of such a surface as a surface with negative curvature, rather than the inside of the ball, as you imagined.

The universe with positive curvature is closed, that is, if we leave the earth from the north pole with light (and enough lifespan) and go all the way along the extension of the earth's axis, one day you will return to the south pole of the earth, mind you, the south pole!

And negative curvature, goodbye, I hope you can turn around and come back one day, or I won't see you again

I hope you understand what I say.

The universe is not a sphere, the area of the sphere is 4 rr, and the size of the universe obviously does not reach this area, the universe is an arc of the approximate sphere, we currently guess that this shape is like a saddle type, but the saddle shape is also unreasonable, the universe should be like a sphere, with the characteristics of a closing cycle. But the saddle shape does not end in cycles. There should not be a reasonable explanation for this shape, a saddle-like surface, but circular like a sphere, similar to a Möbius ring, but certainly not a Möbius ring.

The above cognition is only the cognition in our existing three-dimensional space, so what is the force at the edge of the universe that pulls the edge of the universe and does not let the edge collapse, and approaching the edge is actually approaching a corner of a high latitude. If there really are higher dimensions, then the appearance of the universe can only be judged by the appearance of the entire universe after we turn that edge and look at what another universe looks like.

Many scientists believe that if the universe we live in is a sphere, then when the light departs, those parallel rays will eventually intersect somewhere, because light itself is also a substance, and it will also become distorted by the gravitational pull of the center of the universe and eventually intersect. But a large number of scientific studies have shown that as long as the rays of light in the universe are parallel at the beginning, then they will always remain parallel, but if the universe is flat, then the universe is infinitely extended? In other words, the question of whether there will be an end or boundary in the universe is very worthy of re-discussion by scientists.

Some scientists believe that if the universe is infinitely extended, then the whole universe should be very bright, because there is no boundary will bring infinite extension of light, and the light around the universe will border our universe, so that the whole universe can look brighter, but we all know that this is not the case in fact, so the universe should have a boundary.

Einstein initially thought that the universe was a sphere and proposed a cosmological constant, which was later proved wrong, and Einstein publicly admitted his mistake and affirmed that the shape of the universe was saddle horse (relatively the most plausible) and could be extended infinitely.

When the mass of a star reaches a certain point (whether it is a star, planet, or moon), the gravitational squeeze causes the inner core to deform, and the gravitational squeeze of a larger star causes the inner core to melt. As a result, the structure and shape of the star will change.

The gravitational force is infinite, and the repulsive force between molecules, although much stronger than gravity, requires molecules to be at a very close distance to take effect. When gravity squeezes each part of the star tightly together and gradually shrinks inward. When this contraction is excessive, the repulsive force between the molecules is stronger than the gravitational pull, causing these molecules to be pushed outward.

And when these molecules are pushed away from each other by the repulsive force, the repulsive force fails, and the gravitational force immediately pulls these molecules back again.

In the case of the Earth, for example, when a part of the Earth is too convex (if Mount Everest is ten times higher), the crust at the bottom of the mountain will collapse because it cannot withstand the gravity of the huge mountain, and the buoyancy generated by the lava inside will not be able to support the weight of the mountain. The mountain peaks sink into the lava, and the protrusions gradually sink into the interior of the earth.

If a part of the Earth is too depressed, there is no gravitational (gravitational) force on the surface to squeeze that area, so the repulsion between the lava in the Earth's interior will gain the upper hand and cause the lava flow to expand. Excessive buoyancy is formed, just like a pressure cooker that steam will spew out violently if it lacks that valve. Lift this hollow crust upwards and even break through the crust to spew lava out of the surface.

Therefore, when the shape of the Earth is not "round" enough, the phenomena generated by gravity and repulsion will constantly adjust its shape, and when each part is adjusted to equilibrium by gravity and repulsion, the Earth will be close to a circle. Between any planet, when the mass and gravity reach a certain level, whether it is a star, a planet or a moon, it will become spherical. The minimum lower limit of this requirement is about 800 kilometers in diameter and about 500 million tons in mass.

Stars below this lower limit are irregularly shaped.

There are gases like hydrogen, helium, oxygen, nitrogen, carbon dioxide, etc. in the universe.

1. Hydrogen. It is a colorless, tasteless, odorless, and extremely flammable gas composed of diatomic molecules, and hydrogen is the lightest gas.

2. Helium. It is a type of noble gas. The name of the element is derived from the Greek word for "sun".

3. Oxygen. Colorless and odorless gas, the most common elemental form of oxygen.

4. Nitrogen. It is usually a colorless and odorless gas, and nitrogen is generally less dense than air.

5. Carbon dioxide. It is a common compound in the air, carbon reacts with oxygen to form its chemical formula CO2, a carbon dioxide molecule is composed of two oxygen atoms and one carbon atom through covalent bonds.

There are many theories, some people say that the universe is like two balloons connected together, one balloon inflates and the other balloon compresses. This is the universe.

It was Einstein's steady-state cosmology that said that the universe is round, and he set some cosmological constants, but in the end Einstein also denied his own statement and said that his own was wrong.

As for what the universe looks like, it cannot be described by geometric figures, the approximation of the universe is not only three-dimensional, the three-dimensional universe does not exist in the first place, so it cannot be described by any shape.

There are also people who say that the universe is a constricted space, just like the earth, you go in one direction, and you end up where you started, and they also say that you can't understand what I'm talking about, but for now, no one knows exactly what the universe is. Not to mention its shape.

To know what's outside the universe, you just have to look at what's inside the universe.

What's in the universe? It's matter + space.

First of all, there's a space, it's big, big. There is some substance in space, but not everywhere there is matter.

For example, the earth is a mass of matter, and the moon is a mass of matter, but between the earth and the moon, there is no matter, or there is not so much matter between the two, and the matter is relatively sparse.

The matter in the universe comes from the cosmic egg. A lot of matter has accumulated in the cosmic egg. Suddenly, one day, the egg was **, and the substance was thrown everywhere.

But is the whole space full of matter? No. To be precise, only within the scope of the cosmic egg** has matter, and outside the scope of the impact, there is no matter.

It can be seen that the interior of the universe, that is, within the scope of the cosmic egg**, is "space + matter". And the outside of the universe, that is, outside the scope of the cosmic egg**, there is no matter, that is, "space + matter - matter = space".

Therefore, the universe (** unaffected area) is only space, and there is no matter.

So, what does that space look like without matter? It's not hard to imagine. Near our earth, there are spaces where there is no matter, or little matter, and we can borrow these places to imagine what the universe looks like beyond the universe.