Physical science is the branch of natural science that studies non-living systems and natural phenomena. It focuses on understanding the principles governing the inorganic world, in contrast to life sciences, which study living organisms. Physical science encompasses several core branches:

• Physics: The study of matter, energy, motion, forces, heat, sound, electricity, magnetism, radiation, and the structure of atoms and molecules.
• Chemistry: The study of substances, their composition, properties, and the changes they undergo during reactions.
• Astronomy: The scientific study of celestial bodies, their positions, motion, composition, and the overall universe.
• Earth Sciences: The study of Earth's structure, atmosphere, waters, and related phenomena, including geology, meteorology, oceanography, and environmental science.

In summary, physical science investigates the behavior of inorganic natural objects and fundamental laws governing matter, energy, the universe, and Earth systems. This knowledge helps to understand the universe and supports advancements in technology and various scientific fields. The branches often interconnect to solve complex problems like climate change by integrating physics, chemistry, and earth sciences.