How was the star life cycle started

A lifecycle of star can be determined by the mass of the star.

Explanation:

Stars are formed by the clouds of gases as well as the dust which is known as nebulae. Stars also come across a cycle that is a star is formed from gases and dust, then its grow more, various changes take place while growing after that the life span ends. Millions of year take for the formation of a star, while its growing process it shines brightly for several years. When the fuel present in the stars are exhausted, the star collapse as a result explosion of the outer layer takes place which is referred to as a supernova.