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Everything,every-thing, orevery thing, is all that exists; it is anantithesis (opposite) ofnothing, and itscomplement. It is the totality of things relevant to somesubject matter. Theuniverse is everything that exists theoretically, though amultiverse may exist according to theoretical cosmology predictions. It may refer to ananthropocentricworldview,[1] or the sum of human experience, history, and thehuman condition in general. Everyobject andentity is a part of everything, including allphysical bodies and in some cases allabstract objects.
To describe or know of everything as a spatial consideration in a local environment, such as the world in which humans mostly live, is possible. The detemination of all things in the universe is unknown because of the physics beyond theobserved universe and the problem of knowing physics at the rangeinfinite. To know universally everything as a temporal and spatial consideration isn't possible because of the unavailabilty of information at a certain time before the beginning of the universe and because of the problem ofeternalcausality.
In ordinary conversation,everything usually refers only to the totality of things relevant to the subject matter.[1] When there is no expressed limitation,everything may refer to theuniverse, or theworld.
The universe is most commonly defined as everything that physically exists: the entirety oftime, all forms ofmatter,energy andmomentum, and thephysical laws andconstants that govern them. However, the term "universe" may be used in slightly different contextual senses, denoting such concepts as thecosmos, theworld, ornature. According to some speculations, this universe may be one of many disconnected universes, which are collectively denoted as themultiverse. In thebubble universe theory, there are an infinite variety of universes, each with differentphysical constants. In themany-worlds hypothesis, new universes are spawned with everyquantum measurement. By definition, these speculations cannot currently be tested experimentally, yet, if multiple universes do exist, they would still be part of everything.
Especially in ametaphysical context,World may refer to everything that constitutesreality and theuniverse: seeWorld (philosophy). However, world may only refer toEarth envisioned from ananthropocentric orhumanworldview, as a place byhuman beings.
Intheoretical physics, atheory of everything (TOE) is a hypotheticaltheory that fully explains and links together all known physical phenomena. Initially, the term was used with an ironic connotation to refer to various overgeneralized theories. For example, a great-grandfather ofIjon Tichy—a character from a cycle ofStanisław Lem'sscience fiction stories of the 1960s—was known to work on the "General Theory of Everything". Over time, the term stuck in popularizations ofquantum physics to describe a theory that would unify or explain through a single model the theories of allfundamental interactions in nature.
There have been many theories of everything proposed bytheoretical physicists over the last century, but none have been confirmed experimentally. The primary problem in producing a TOE is that the accepted theories ofquantum mechanics,general relativity, andspecial relativity are hard to combine. Theories exploring quantum mechanics and string theory are easier to combine[citation needed].
Based on theoreticalholographic principle arguments from the 1990s, many physicists believe that 11-dimensionalM-theory, which is described in many sectors bymatrix string theory, and in many other sectors byperturbative string theory, is the complete theory of everything. Other physicists disagree.
In philosophy, atheory of everything orTOE is an ultimate, all-encompassing explanation ofnature orreality.[2][3][4] Adopting the term from physics, where the search for atheory of everything is ongoing,philosophers have discussed the viability of the concept and analyzed its properties and implications.[2][3][4] Among the questions to be addressed by aphilosophical theory of everything are: "Why is reality understandable?", "Why are the laws of nature as they are?", and "Why is there anything at all?".[2]
