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### String Theory: Gravity as Geometry

The theory of the space-time continuum already existed, but under general relativity Einstein was able to describe gravity as the bending of space-time geometry. Einstein defined a set of [more…]

### String Theory Creates a Theory of Everything

String theory is a type of high-energy theoretical physics, practiced largely by particle physicists. It’s a *quantum field theory* that describes the particles and forces in our universe based on the way [more…]

### A Quick Look at String Theory

String theory was originally developed in 1968 as a theory that attempted to explain the behavior of *hadrons* (such as protons and neutrons, the particles that make up an atomic nucleus) inside particle [more…]

### String Theory: Strings and Branes

When string theory was originally developed in the 1970s, the filaments of energy in string theory were considered to be 1-dimensional objects: strings. [more…]

### String Theory and Supersymmetry

According to string theory, all particles in the universe can be divided into two types: bosons and fermions. String theory predicts that a type of connection, called [more…]

### String Theory Explains Matter and Mass

One of the major goals of current string theory research is to construct a solution of string theory that contains the particles that actually exist in our universe. [more…]

### String Theory Defines Space and Time

In many versions of string theory, the extra dimensions of space are compactified into a very tiny size, so they’re unobservable to our current technology. Trying to look at space smaller than this compactified [more…]

### Landscape of Possible String Theories

One of the most unexpected and disturbing discoveries of string theory is that instead of one single theory, it turns out there may be a huge number of possible theories [more…]

### Possible Implications of String Theory

String theory leads to some amazing (and controversial) implications. Although string theory is fascinating in its own right, what may prove to be even more intriguing are the possibilities that result [more…]

### Why Is String Theory So Important?

String theory yields many fascinating subjects for thought, but you may be wondering about the practical importance of it. For one thing, string theory is the next step in our growing understanding of [more…]

### String Theory: Two Schools of Thought on Gravity

Physicists are searching for a theory of quantum gravity because the current laws governing gravity don’t work in all situations. Specifically, the theory of gravity seems to “break down” [more…]

### String Theory: A Matter of Mass

When you read that the force between objects is proportional to the mass of the two objects, you may think this means that heavier things fall faster than lighter things. For example, wouldn’t a bowling [more…]

### String Theory and Newton’s Law of Gravity

String theory is based upon our understanding of matter and the other forces of nature, in terms of quantum mechanics, including Newton's law of gravity. [more…]

### String Theory Describes Matter as Physical and Energy-Filled

String theory is currently the most likely candidate for a successful theory of quantum gravity. Because gravity is an interaction between objects made up of matter, understanding matter is crucial to [more…]

### String Theory and Einstein’s Law of Gravity

Since string theory is related to the theory of quantum gravity, a good place to begin is by giving an overview of the scientific understanding of gravity, which is defined by Einstein’s theory of general [more…]

### String Theory and Electromagnetism: Super-Speedy Energy Waves

Discovered in the 19th century, the *electromagnetic force*(or *electromagnetism*) is a unification of the electrostatic force and the magnetic force. In the mid-20th century, this force was explained in a [more…]

### String Theory's Roots in Ancient Philosophy

No matter how complex modern physics concepts get, they have their roots in basic classical concepts. To understand the revolutions leading up to string theory, you need to first understand these basic [more…]

### String Theory and the Conservation of Mass

There are some physics concepts that you need to be familiar with to understand string theory. First, look at the history of a fundamental principle in physics: the [more…]

### String Theory and Energy

String theory makes predictions about physical systems that contain a *large* amount of energy, packed into a very small space. The energies needed for string theory predictions are so large that it might [more…]

### String Theory and Symmetry

String theory goes beyond the symmetries we observe to predict even more symmetries that aren’t observed in nature. It predicts a necessary symmetry that’s not observed in nature, called [more…]

### String Theory and Waves

Waves (as we usually think of them) move through some sort of medium. If you flick the end of a jump-rope or string, a wave moves along the rope or string. Waves move through the water, or sound waves [more…]

### String Theory and Vibrations

String theory depicts strings of energy that vibrate, but the strings are so tiny that you never perceive the vibrations directly, only their consequences. To understand these vibrations, you have to understand [more…]

### String Theory and the Search for the Ether

Here you have only a glimpse of relativity — the glimpse needed to understand string theory. This article explains how the ether model failed to match experimental results and how Einstein introduced special [more…]

### String Theory Unifies Space and Time

Einstein’s theory of special relativity has had far-reaching implications, but it has left open certain questions that string theory hopes to answer. It has altered our understanding of time and space. [more…]

### String Theory Unifies Mass and Energy

Einstein's work led to a theory that tried to unify relativity and electromagnetics and is seen by many as a predecessor of string theory. The most famous work of Einstein’s life also dates from 1905 [more…]