2. A speculative idea or plan as to how something might be done.
3. A formulation of apparent relationships or underlying principles of certain observed phenomena which have been verified to some degree.
4. That branch of an art or science consisting in a knowledge of its principles and methods rather than in its practice; pure, as oppoed to applied, science, etc.
5. Theory implies considerable evidence in support of a formulated general principle explaining the operation of certain phenomena; as in the theory of evolution.
6. A belief that guides action or assists comprehension or judgment in some action.
7. An assumption based on limited information or knowledge; a conjecture.
According to this concept, such materials became trapped far below the earth's crust when the basic structure of the planet evolved, and have subsequently migrated into reservoirs and to the surface through openings in in the earth's crust.
Contrasted with the more generally accepted biogenic theory that hydrocarbon deposits derive from the remains of living organisms.
Generally accepted in preference to the abiogenic theory that hydrocarbon deposits became part of the earth as it formed.
See electromagnetic theory of light or take a look at production and interrelation of electric and magnetic fields, Maxwell's equations for explanations of what the term, Maxwell's equations, is all about.
2. The theory that light consists of electromagnetic radiation and therefore obeys Maxwell's equations; contrasted with earlier concepts that light was a stream of tiny particles or light was a wave in a medium of ether.
Maxwell's equations consists of the four fundamental equations that describe the behavior of electric and magnetic fields in time and space and the dependence of these fields on the distribution and behavior of electric charges and currents.
These four partial differential equations relate to the electric and magnetic fields to their sources, charge density, and current density.
This replaced the earlier geocentric (earth-centered) system described by Ptolemy (c. A.D. 100-170).
Ptolemy was a Greek philosopher who presented a widely accepted model of the solar system known as the "Ptolemaic system". He also made important contributions to geography and cartography.
The "Ptolemaic system" was a theory developed by Ptolemy, about A.D. 150, maintaining a motionless earth is the center of the universe with sun, moon, and planets revolving, around it; while the fixed stars are attached to an outer sphere concentric with the earth. This model was generally accepted in the West until the establishment of the "Copernican theory" about 1500 years later.
Nicolaus Copernicus (1473-1543), is the Latinized version of the name Mikolaj Kopernik, the Polish astronomer who established the heliocentric model of the solar system; that is, the principle that the sun (not the earth) is the central point to which the motions of the planets are to be referred.
Copernicus was recognized as the first person in history to create a complete general arrangement of the solar system (Copernican system); combining mathematics, physics, and cosmology.
The miasmatic theory of disease apparently started in the Middle Ages and continued on into the mid 1800's, when it was used to explain the spread of cholera in London and in Paris, partly explaining Haussmann's latter renovation of the French capital.
Baron Georges-Eugène Haussmann (March 27, 1809–January 11, 1891) was a French civic planner whose name is associated with the rebuilding of Paris. He was born in that city of a Protestant family from Alsace. The Haussmann Renovations, or Haussmannization of Paris was a work led under the initiative of Napoléon III and the Seine préfet, Haussmann, from 1852 to 1870.
The project encompassed all aspects of urban planning, both in the center of Paris and in the outside districts: streets and boulevards, regulations imposed on façades of buildings, public parks, sewers and water works, city facilities and public monuments.
The disease was said to be preventable by cleansing and scouring of the body and items. Dr. William Farr, the assistant commissioner for the 1851 London census, was an important supporter of the miasma theory. He believed that cholera was transmitted by air, and that there was a deadly concentration of "miasmata" near the Thames River banks.
Another proponent of the "miasmatic" theory was the renowned Crimean War nurse, Florence Nightingale (1820-1910), who was known for her work in making hospitals sanitary and fresh-smelling.
The discipline is subdivided into what can be called speculative and analytic theory.
Speculative theory engages in reconciling with music certain philosophical observations of man and nature.
It can be prescriptive when it imposes these extramusical contentions to establish an aesthetic norm.
In more general usage, the term musical theory is used to include the study of acoustics, harmony, and ear training.
2. Specifically, the effort by Einstein and others to unify gravitational force and electromagnetic force with a single set of laws and, more generally, to provide a geometrical interpretation for all physical interactions.
A theory can lead to a new conclusion or the discovery of a phenomenon. Developments of a theory often result in a change in paradigm; that is, looking at or thinking about a scientific problem in a totally different way as indicated by a set of assumptions, concepts, values, and practices that constitute a way of viewing reality for the scientific community that shares them.
2. The hypothetical "massive explosive" event that is said to have marked the origin of the universe as we know it, about 18 billion years ago.
According to the theory, at the time of the Big Bang, the entire universe was squeezed into a hot, superdense state and the explosion threw the compact material outward, producing the expanding universe.
2. A rival theory to that of the Big Bang which claims that the universe has no origin but is expanding because new matter is being created continuously throughout the universe.
The theory was proposed in 1948 by Austrian-born British cosmologist Hermann Bondi, Austrian-born U.S. astronomer and physicist Thomas Gold, and English astronomer Fred Hoyle, but this concept was challenged in 1965 by the discovery of cosmic background radiation and is now largely rejected by scientists.