The "protostar". That's not classed as a true star, but I think that's the answer.
stellar nebula
What is capella star life cycle
The "star life cycle" refers to stars. Earth is not a star.
Protostar!
Life Cycle of a Star
No, a protostar is basically the BEGINNING of a star's life cycle.
Stars go through stages like birth, main sequence, red giant, and death, which can last millions or billions of years. In comparison, humans have a much shorter life cycle, typically living for decades. Both stars and humans undergo changes over time and eventually cease to exist.
Formation of the star out of a giant cloud of gas and dust.
what is the third stage of the star cycle
Nebulae are associated with the end of a star's life cycle, as they are shells matter that blown off a star, usually in a series of events, when a star is in its death throws.
How does the life cycle of humans compare to the life cycle of a star? They both have stages where they are born and die which is in the main sequence and supernova and in a human they are born in a womb and die of old age.
Nobody "invented" it, the life cycle of stars happens naturally.