How many different dimensions exist
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How Many Dimensions Are There?
However, the reality of dimensions and how they play a role in the ordering of our Universe is really quite different from this popular characterization. To break it down, dimensions are simply the different facets of what we perceive to be reality. We are immediately aware of the three dimensions that surround us on a daily basis — those that define the length, width, and depth of all objects in our universes the x, y, and z axes, respectively. Beyond these three visible dimensions, scientists believe that there may be many more. In fact, the theoretical framework of Superstring Theory posits that the universe exists in ten different dimensions.
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In physics and mathematics , the dimension of a mathematical space or object is informally defined as the minimum number of coordinates needed to specify any point within it. The inside of a cube , a cylinder or a sphere is three-dimensional because three coordinates are needed to locate a point within these spaces. In classical mechanics , space and time are different categories and refer to absolute space and time. That conception of the world is a four-dimensional space but not the one that was found necessary to describe electromagnetism. The four dimensions of spacetime consist of events that are not absolutely defined spatially and temporally, but rather are known relative to the motion of an observer. Minkowski space first approximates the universe without gravity ; the pseudo-Riemannian manifolds of general relativity describe spacetime with matter and gravity. Ten dimensions are used to describe superstring theory , eleven dimensions can describe supergravity and M-theory , and the state-space of quantum mechanics is an infinite-dimensional function space.