The four main components of galaxy are Stars, gas, dust, and other objects
Galaxy is a any type system that contain stars,dust, stars remnants, interstellar gas, dark matter and other objects to form universe.
It is derived from Greek word which means milky ,hence it is termed milky way.
Galaxies have different shapes and variations in which the systems are formed.
Galaxies have different in structure and the king of activities that occur in them. Some are site of formations of vigorous sites and so on.
Therefore,