What is Physics? As I researched, I found many different definitions of Physics, some being very complex and others being simple and to the point. In defining physics, firstly, I would have to mention that the early history of physics is interrelated with that of other sciences, maths and concepts. As we know, the first areas of physics to receive close attention were mechanics and the study of planetary motions. The great breakthrough in astronomy, another form of science, was made by Nicolaus Copernicus, who proposed the heliocentric model of the solar system that was later modified by Johannes Kepler, using observations by Tycho Brahe, into the description