Final answer:
Physical science is the study of matter and energy and includes fields such as physics, chemistry, and astronomy, focusing on nonliving matter.
Step-by-step explanation:
The best definition of physical science is the study of matter and energy, and the relationship between matter and energy. This field includes various sciences such as astronomy, physics, and chemistry, which are concerned with nonliving matter. Physics is considered the most fundamental of the physical sciences as it deals with the principles that govern energy, matter, space, and time, and their interactions. Chemistry focuses on the composition, properties, and transformation of matter, while astronomy studies celestial bodies like stars and planets.