Astrophysics is the branch of astronomy that deals with the physics of the universe, especially with “the nature of the heavenly bodies, rather than their positions or motions in space. Among the objects studied are galaxies, stars, planets, extrasolar planets, the interstellar medium and the cosmic microwave background. Their emissions are examined across all parts of theelectromagnetic spectrum, and the properties examined include luminosity, density, temperature, and chemicalcomposition. Because astrophysics is a very broad subject, astrophysicists typically apply many disciplines of physics, including mechanics, electromagnetism, statistical mechanics, thermodynamics, quantum mechanics,relativity, nuclear and particle physics, and atomic and molecular physics.

Astronomy is the scientific study of celestial objects, such as stars, planets, comets, and galaxies, and the phenomena that exist beyond the earth’s atmosphere. Through the use of physics, astronomy explains the evolution of the universe and through sound mathematical simulations it forecasts its development.

The main Branches of Astrophysics or Astronomy are:
1. Solar Astrophysics
2. Stellar Astrophysics
3. Planetary Astrophysics
4. Galctic Astrophysics
5. Extragalactic Astrophysics
6. Cosmology

It deals with the physical properties of celestial bodies and with the interaction between matter and radiation in the interior of celestial bodies and in interstellar space.
It can be broken down into observational and theoretical astrophysics. COSMOLOGY is the combination of astrophysics and particle physics. It is the study of the structure, origin and evolution of the universe. Cosmologists seek to understand how the universe came into being, why it is the way it is and what the future has in store.

It is the combination of astronomy and chemistry, dealing with the chemical composition and evolution of the universe and its parts. It is the study of the chemical elements found in outer space and their interactions.

It is the science dealing with the structure and composition of all solid bodies in the solar system, including planets, stars, satellites, asteroids, comets and meteorites.

It is the study of the theoretical effects of astronomical bodies and forces on the earth’s atmosphere. Astrometry is the branch of astronomy that deals with the precise measurement of the positions and motions of the celestial bodies. The information obtained by astrometric measurements is very important in contemporary research of the solar system and our galaxy, the Milky way.

It is the study of life beyond the earth’s atmosphere on other planets. It combines aspects of astronomy, geology and biology.

To study of optical band is called optical astronomy.

The study of the radio band is called Radio astronomy.

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