Physical science is a natural science and includes astronomy, physics, chemistry and earth sciences. Physical science is the study, measurement and observation of nonliving objects whereas biological science is the study of living objects.
Astronomy, physics, chemistry and earth sciences are the major fields within physical science, and they contain several subfields. For example, physics focuses on the properties of atoms, while chemistry emphasizes how these properties change as atoms interact with each other. Carbon also blurs the line between the study of living and non-living objects. When chemistry involves the study of carbon, it becomes biochemistry in the field of biological science. The physical sciences were born out of a response to mystical and mythical beliefs in the natural world. The first physical scientists were able to explain natural phenomenon by observing their physical properties and repetition in the environment. For instance, the ancient Greeks believed a rainbow after a rainstorm was a blessing from the gods, until repeated observation of their occurrence was paired with the study of light fractals created by prisms. The creation of the physical sciences also led to the use of the scientific method. Physical scientists observe natural processes; they form hypotheses and continue to observe processes until a hypothesis is upheld or disproved under those conditions.