Natural Science

Natural science is the systematic study of the physical universe and all phenomena that occur within it, relying exclusively on empirical observation, experimentation, and logical reasoning to describe, explain, and predict events based on evidence that can be independently verified and reproduced.  It encompasses the investigation of matter, energy, forces, living organisms, and the processes that govern the Earth and cosmos, with the core objective of uncovering regular patterns and underlying laws that operate independently of human invention or intervention.

Natural science is one of the four branch of science that systematically studies the natural world, meaning all physical, chemical, and biological phenomena that occur in the universe, through observation, experimentation, and the application of empirical evidence.  It is grounded in the scientific method, which requires hypotheses to be testable, results to be reproducible, and conclusions to be based on measurable data rather than opinion or belief.

It encompasses well-established disciplines such as physics (the study of matter, energy, and fundamental forces), chemistry (the composition, structure, and reactions of substances), and biology (the study of living organisms and life processes), along with earth and space sciences that examine the Earth and the universe.  The defining characteristic of natural science is its reliance on observable and quantifiable evidence to develop laws, theories, and models that explain natural phenomena with predictive capability. 

Natural Science Branches

Astronomy  -  Systematically studies celestial objects, space, and the physical universe beyond Earth's atmosphere, including stars, planets, galaxies, and cosmic phenomena, using empirical observation, telescopes, and mathematical models to explain their origins, evolution, and behavior based on verifiable evidence from light, radiation, and gravitational data.
Biology  -  Concerned with the study of life and living organisms, encompassing their structure, function, growth, origin, evolution, and interactions with the environment, relying on empirical methods such as observation, experimentation, and genetic analysis to establish verifiable principles like cell theory, genetics, and natural selection.
Chemistry  -  Investigates the composition, structure, properties, and transformations of matter, including elements, compounds, and reactions, through controlled experiments and quantitative measurements to derive verifiable laws governing atomic and molecular interactions, as established since the development of modern atomic theory.
Earth Science  -  Focused on the study of the Earth and its dynamic systems, including geology, oceanography, meteorology, and environmental processes, using empirical data from field observations, satellite measurements, and laboratory analysis to explain plate tectonics, climate patterns, and planetary history through reproducible evidence.
Physics  -  Examines the fundamental principles of matter, energy, space, time, and the forces governing the universe, employing mathematical models, experiments, and observations to formulate verifiable laws such as Newton's mechanics, thermodynamics, and relativity, which underpin all other natural sciences.