Physical science is any of the branches of natural science and science that study non-living systems. This branch of natural science tries to predict and explain different nature's phenomena, using certain empirical evidence. Physical science also makes use of different scientific methods or processes in order to test some hypotheses before they can become scientific theories.
What this means is that any hypothesis must be proven scientifically before it can be considered as a scientific theory. There are different branches of natural science; they include chemistry, physics, astronomy, and Earth science.
Physics is a branch of physical science that deals with matter and its motion through time and space. Chemistry deals with the study of the composition, properties, structure, and change of matter. A field under physical science that deals with planet Earth are called Earth science. Astronomy deals with the study of celestial objects such as moons, stars, asteroids, galaxies, etc.