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In science, a theory is a well-tested explanation of facts: "A model or framework (made up of a body of principles) to explain phenomena." [1]

In a context of biological evolution, Pope John Paul II wrote:

A theory is a metascientific elaboration, distinct from the results of observation but consistent with them. By means of it a series of independent data and facts can be related and interpreted in a unified explanation. A theory's validity depends on whether or not it can be verified, it is constantly tested against the facts; wherever it can no longer explain the latter, it shows its limitations and unsuitability. It must then be rethought. [1]

The term "theory" is often used outside of the realm of natural science, such as in music theory, number theory, game theory, or Marxist theory. In this usage, theory is used to refer to an area of study.


  1. Pope John Paul II, Message to Pontifical Academy of Sciences October 22, 1996.

See also