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In the twentieth century, two theoretical frameworks emerged for formulating the laws of physics.
By the late 1970s, these two frameworks had proven to be sufficient to explain most of the observed features of the universe, from elementary particles to atoms to the evolution of stars and the universe as a whole.
In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings.
It describes how these strings propagate through space and interact with each other.
On distance scales larger than the string scale, a string looks just like an ordinary particle, with its mass, charge, and other properties determined by the vibrational state of the string.
In string theory, one of the many vibrational states of the string corresponds to the graviton, a quantum mechanical particle that carries gravitational force. String theory is a broad and varied subject that attempts to address a number of deep questions of fundamental physics.
String theory has been applied to a variety of problems in black hole physics, early universe cosmology, nuclear physics, and condensed matter physics, and it has stimulated a number of major developments in pure mathematics.
Because string theory potentially provides a unified description of gravity and particle physics, it is a candidate for a theory of everything, a self-contained mathematical model that describes all fundamental forces and forms of matter.Despite much work on these problems, it is not known to what extent string theory describes the real world or how much freedom the theory allows to choose the details.String theory was first studied in the late 1960s as a theory of the strong nuclear force, before being abandoned in favor of quantum chromodynamics.Subsequently, it was realized that the very properties that made string theory unsuitable as a theory of nuclear physics made it a promising candidate for a quantum theory of gravity.The earliest version of string theory, bosonic string theory, incorporated only the class of particles known as bosons.It later developed into superstring theory, which posits a connection called supersymmetry between bosons and the class of particles called fermions.