In our universe there is only one kind of space: absolute space. Absolute space is where things and events can never change from one position to another, where things cannot be separated from one another; it is an unchanging place where nothing ever changes no matter what time it is in.
In reality there are three different kinds of space: absolute space, relative space, and relative space in space. Absolute space, like space that we experience on Earth, is an unchangeable and endless realm where nothing can exist at all. On the other hand, relative space, also called space-time, is the space that exist between and within events, and relative to other objects in the space. It is not an eternal realm, but only exists between events.
The fourth kind of space, spacetime, is space-time that exists along with other objects, like an atom. When objects are placed together in spacetime, they will remain together until one of them comes in contact with an outside force, like gravity. Gravity pulls space-time into a curved shape, just as the shape of water that moves around the bottom of a swimming pool, the shape of the Earth that rotates on its axis, and even the shape of the stars that revolve around the Earth as it revolves around the Sun.
The existence of absolute space, relative space, and spacetime have led scientists to believe that there are some basic rules that govern the existence of these three different kinds of space. Scientists have proposed several theories as to the cause of this space-time. One theory says that space and time are created by a singularity, or a singularity that separates two parts of spacetime, like the bottom part of an hour glass. The theory also suggests that space-time was created by a Big Bang that took place approximately thirteen billion years ago. This theory is based on the idea that this event occurred when the space-time was very hot and very dense.
Other scientists propose that absolute space and relative space are the same thing, and both are different from spacetime itself. These scientists propose that there is a difference between the distance between objects in absolute space and relative space, but no other differences that would affect space, such as length, breadth, and height. These theories also suggest that space is made up of a number of small discrete regions of space-time, which can change according to the laws of quantum mechanics. Another scientist suggests that space and time are separated by an event horizon, which is a boundary, or a boundary that the boundary does not allow light to pass through, but only sound, heat and cold to pass through.
Some scientists suggest that space-time is made up of “virtual” spaces, like an ocean or a flat surface, and there is no difference between the real world and the virtual world. Others say that space-time has been created from space, but this theory is based on an argument that space and time are real in the absence of any matter and energy. These experts believe that space and time are created when an object is in an inertial reference frame (which is, in reference to itself, neither moving nor accelerating), but the object is not measured or observed. The theory is based on the premise that the space is filled with energy, which is equal to the sum total of all the forces of nature.