Classification of cosmic disciplines:

According to the classification of research methods, three branches of astrometry, astromechanics and astrophysics have been formed. According to the classification of observation methods, several sub-disciplines of optical astronomy, radio astronomy and space astronomy were formed.

Cosmic science is a branch of astronomy and physics, which studies the structure, movement and evolution of the universe from a holistic perspective. Einstein proved that space and time (spacetime) are inseparable from matter. The universe is recognized as an evolving whole, which is of great significance in the development of modern natural science.