Theory of Science

Science is broken up into four branches:

Physical ScienceEarth ScienceLife ScienceFormal Science

Each of these branches have a few main branches, and then sub-fields within those branches. I know it sounds a little confusing, but it won’t be after I break it up for you. Let’s start with the branches of Physical Science.

The main branches of Physical Science are:

PhysicsChemistryAstronomy

Each of these branches have sub-fields:

Physics has Optics, Nuclear Physics, Mechanics, Atomic Physics, and more.Chemistry has Biochemistry, Industrial Chemistry, Physical Chemistry, Polymer Chemistry, and more.Astronomy has Astrophysics, Astrobiology, Solar Astronomy, Planetary Astronomy, and more.

The main branches of Earth Science are:

GeologyMeteorologyOceanography

Each of these branches have sub-fields:

Geology has Physical Geology, Mineralogy, Petrology, Historical Geology, and more.Meteorology has Physical Meteorology, Synoptic Meteorology, Dynamic Meteorology, and more.Oceanology has Marine Biology, Physical Oceanology, Chemical Oceanography, and more.

Life Science is a major part of the world around us, so naturally, it has more branches. These include:

BiologyZoologyMicrobiologyBiochemistry

Each of these branches have sub-fields:

Biology has Botany, Ecology, Cell Biology, Biophysics, Anatomy, and more.Zoology has Bionics, Cetology, Entomology, and more.Microbiology has Bacteriology, Immunology, Virology, Parasitology, and more.Biochemistry has Xenobiotics, Structural Biochemistry, Enzymology, and more.

The main branches of Formal Science are:

Computer ScienceMathematicsSystems Science

Each of these branches have sub-fields:

Computer Science has Robotics, Computer Engineering, Artificial Intelligence, and more.Mathematics has Geometry, Algebra, Calculus, Topology, Probability, Statistics, and more.Systems Science has Engineering, Cybernetics, Linguistics, and more.

And that’s all! I hope this answer helps you understand how science is broken down, and if not, I encourage you to read more about the topic. Also, if anyone finds a mistake in this answer, please let me know!