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The main physics theory
Although the physics discussed a wide range of systems, there are some overall theory used in physics, not in one field only. Each theory is believed to be true, in particular the validity region. For example, the theory of classical mechanics can explain the movement of objects correctly, provided that this thing is bigger than atoms and moving at speeds much slower than the speed of light. These theories are still observed, for example, the admirable aspects of classical mechanics known as chaos theory found in the twentieth century, three centuries after formulated by Isaac Newton. However, few physicists who consider these basic theories deviate. Therefore, theories were used as the basis for research into more specific topics, and all principals of physics, whatever his specialty, are expected to understand those theories.