Is the universe a four dimensional space? Is the universe three dimensional?

Yes, the universe is four-dimensional, but three dimensions are space and the other is time. Therefore, it cannot be said that "the universe is a four-dimensional space".

However, it is not possible to separate three-dimensional space from one-dimensional time. In fact, space must be represented by time, and time must also be attached to space in order to exist, that is, there is no space without time, and there is no time without space. This is the universe.

If the universe is said to be a four-dimensional space, then the fourth dimension should be time.

But if we only consider space (the concept of space as opposed to time), then at least the space we are in is clearly a three-dimensional space.

However, if we are talking about the universe, then the problem is complicated.

More than one doctrine suggests that our universe is not the only one.

And our universe alone is not just the space we live in!

I think that the universe is in four dimensions, and the three spatial dimensions constitute only space. And if we consider space rather than space-time, the universe is three-dimensional! But our universe has time, so the universe is 4 dimensions. The internal space of a black hole is 5 dimensions because of the extra gravity dimension.

The space we are in should be said to be a four-dimensional space--- three spatial dimensions, and one time dimension.

But the rest of the universe is not necessarily four-dimensional. And there's more to it than we have a universe.

Space plus time is the four-dimensional world.

All theories about the universe are now conjectures ...

According to the theory of relativity, time and space are interconnected.

The universe is an 11-dimensional space.

The universe is physically defined as all space and time (collectively referred to as space-time) and their connotations, including all forms of energy, such as electromagnetic radiation, ordinary matter, dark matter, dark energy, etc., of which ordinary matter includes planets, satellites, stars, galaxies, galaxy clusters, and intergalactic matter. The universe also includes physical laws that affect matter and energy, such as conservation laws, classical mechanics, relativity, etc.

Physical. Of the four fundamental interactions, gravity dominates the astronomical scale. Gravitational effects are cumulative, in contrast, the effects of positive and negative charges tend to cancel each other out, making the electromagnetic force relatively insignificant on astronomical scales.

The other two interactions, weak and strong nuclear forces, decline very quickly with distance, and their effects are mainly confined to the subatomic scale.

It seems that there is more matter in the universe than antimatter, an asymmetry that may be related to CP destruction. This imbalance between matter and antimatter is partly responsible for the existence of all matter at the moment, because if the same amount of matter and antimatter were produced in the Great **, there would be an interaction that completely annihilated each other, leaving only photons.

The universe also does not seem to have either net momentum nor angular momentum, and if the universe is finite, it follows the accepted laws of physics. These laws are Gauss's law and non-divergence pressure energy momentum pseudotensor.

Four-dimensional space is different from three-dimensional space, which refers to standard Euclidean space, which can be extended to n-dimensional; The four-dimensional time town is a misunderstanding of Minkowski's concept of space. As three-dimensional objects, human beings can understand four-dimensional space-time (three spatial dimensions and one temporal dimension), but they cannot recognize and exist in four-dimensional space, because human beings belong to the third spatial dimension. Time is usually the fourth dimension, that is, the time dimension under the fourth dimension of space-time.

The fourth dimension of four-dimensional space refers to the dimension of space with the same properties as x, y, and z. However, four-dimensional space-time is not a standard Euclidean space, and the essence of time is to describe the speed of motion.

Through the evolution of one-dimensional, two-dimensional, and three-dimensional space, people have put forward some conjectures about four-dimensional space. Although these conjectures cannot be proven correct now, many scientific theories have their origins in conjecture. Nowadays, scientific theories are generally based on the summary of phenomena, but there is no accurate and clear understanding of the phenomena in the four-dimensional space, or the phenomena are not caused by the four-dimensional space without thinking about it.