Earth science or geoscience includes all fields of science associated with the earth. This is often a branch of science handling the physical and chemical constitution of the world and its atmosphere. natural science are often considered to be a branch of planetary science, but with a way older history. natural science is formed of the many branches of data concerning all aspects of the world system. the most branches are geology, meteorology, climatology, oceanography, and ecology. Astronomy uses principles understood from Earth to find out about the system, galaxy and universe.