Quantum Mechanics is not a major branch of Astrophysics, but rather a fundamental theory in Physics that deals with the behavior of matter and energy at the atomic and subatomic level.

Observational Astrophysics involves collecting and analyzing data from telescopes, satellites, and other instruments to study celestial objects and phenomena.

Stellar Astrophysics focuses on understanding the structure, composition, and behavior of stars, including their formation, evolution, and eventual fate.

Astrobiology is the study of the origin, evolution, and distribution of life in the universe, including the search for life beyond Earth.

Cosmology is the study of the origin, evolution, and structure of the universe as a whole, including the formation and evolution of galaxies.

Planetary Science involves studying the physical and chemical properties of planets, moons, asteroids, comets, and other small bodies in our solar system and beyond.

Stellar Astrophysics includes the study of black holes, which are formed when massive stars collapse at the end of their lives.

Theoretical Astrophysics involves developing mathematical models and theories to explain various astrophysical phenomena, such as the behavior of stars, galaxies, and the universe as a whole.

Cosmology includes the study of the interactions between galaxies and other large-scale structures in the universe.

Observational Astronomers collect and analyze data from telescopes, satellites, and other instruments to study celestial objects and phenomena.

Stellar Astrophysics includes the study of neutron stars, which are formed when massive stars collapse at the end of their lives.

Computational Astrophysics involves using computers to simulate and model astrophysical phenomena, such as the behavior of stars, galaxies, and the universe as a whole.

Cosmology is the study of the origin, evolution, and structure of the universe as a whole, including the formation and evolution of the universe.

Astrochemists conduct laboratory experiments to study the chemical composition and reactions of extraterrestrial materials, such as meteorites and interstellar dust.

Stellar Astrophysics includes the study of white dwarfs, which are formed when low-mass stars collapse at the end of their lives.