The longest stage of stellar evolution is the main sequence phase.
The first stage of stellar evolution is nebula.
Helium burning is most durable stage in stellar evolution.
Main Sequence
I know of no star by that name.
Our Sun is currently on the Main Sequence stage of it's evolution.
You can find an overview of stelar evolution in the Wikipedia article entitled "Stellar evolution".
Stellar evolution is the term for the changes a star undergoes during its lifetime.
Nuclear fusion affects stellar evolution by essentially halting all mitosis and miosis that any cells in a stellar evolution could experience, and they stunt the growth of the object.
The main sequence stage is a point in the stellar evolution of stars in the universe at which every star converts hydrogen into helium in its cores and releases huge amounts of energy.
Type II supernova. Formation of a neutron star or black hole.
There is no known role of magnetism in stellar evolution.
Scientist believe that stellar evolution contained only hydrogen and then helium.