What components are necessary to classify a grouping of stars and planets as a galaxy?
Answers
A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems. Star systems are not to be confused with planetary systems, which include planets and similar bodies
Galaxy: A Galaxy is a collection of billions of stars, dust, matter, planets. This Big Bang, is made up of innumerable galaxies. Galaxy have their so many components like stars, planetary system, Asteroid belts. There are innumerable galaxies in this universe. Galaxies have their types according to their shape.
Types of Galaxies:
1) Elliptical Galaxy
2) Spiral Galaxy
3) Irregular Galaxy
Our solar system is a part of Spiral Galaxy. Milky way is a galaxy in which solar system is present. Our milky way has spiral shape, because of which, our galaxy is spiral galaxy.
Our Milky way have so many solar systems like our. Every solar system has stars, planetary system, Natural satellites.
Our solar system consists Ordinary star Sun. And there are some small stars too. Our solar system has 8 planets. Also, our solar system has Natural satellites like moon.