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|Description=A theory is said to be pursued if it is considered worthy of further development. [[CiteRef::Barseghyan (2015)|pp. 30-42]] An example is provided by mid-seventeenth century science. Throughout this period, the Aristotelian natural philosophy, with its geocentric cosmology, four elements, and four causes remained [[Theory Acceptance|accepted]] by the scientific community of Europe as evidenced, for example, by its central place in university curricula. The theories from this period that we are most familiar with from modern popular and professional literature, like Copernicus's heliocentric cosmology, and Galileo's theories of motion, were not accepted, but pursued theories. More generally these included the mechanical natural philosophy championed by a community which included [[Rene Descartes|Descartes]], Huygens, Boyle, and many others, and the magnetical natural philosophy, espoused by Gilbert, Kepler, Stevin, Wilkins and others. In our modern world, the major accepted physical theories include Einstein's relativity theory, quantum mechanics, and the standard model of particle physics. A variety of other theories are not accepted but are being pursued. These include including various versions of string theory, and attempts to quantize general relativity, to create a quantum theory of gravity.[[CiteRef::Barseghyan (2015)|p. 40]]