Together, these universes comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them. The different universes within the multiverse are called “parallel universes”, “other universes”, “alternate universes”, or “many worlds”.

When researchers at Google announced last fall that they had achieved “quantum superiority”—a point at which a quantum computer can perform a task beyond the reach of regular computers—some people wondered what the big deal was.

Light clocks A and B moving horizontally through space. But in the 106 years since Einstein, the prevailing view in physics has been that time serves as the fourth dimension of space, an arena represented mathematically as 4D Minkowski spacetime. …

In mathematics, the notion of dimension is an extension of the idea that a line is one-dimensional, a plane is two-dimensional, and space is three-dimensional.

Although the theory of gravity in extra dimensions is not string theory, which characterizes fundamental particles as bits of “string” vibrating in numerous, incredibly compact extra dimensions, Arkani-Hamed and his colleagues have shown that their theory is in fact compatible with string theory.

Why Nine? Many of us think of wellness in terms of physical and mental health. At Rollins, holistic wellness has nine interconnected dimensions: physical, emotional, creative, environmental, financial, occupational, intellectual, social, and spiritual.

In mathematics, a sequence of n real numbers can be understood as a point in n-dimensional space. When n = 9, the set of all such locations is called 9-dimensional space. Often such spaces are studied as vector spaces, without any notion of distance.