Main Sequence
I know of no star by that name.
The first stage of stellar evolution is nebula.
The longest stage of stellar evolution is the main sequence phase.
Helium burning is most durable stage in stellar evolution.
Our Sun is currently on the Main Sequence stage of it's evolution.
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.
Altair is still in the main sequence stage of a stars life. See related link for more information.
Sirius consists of two stars.Sirius A is a main-sequence star with about two solar masses.Sirius B is a white dwarf with about one solar mass. During its main-sequence, it's estimated to have been around five solar masses.
In G-type stars, this would be the white dwarf stage. More massive stars could continue to fuse ever heavier elements, until the fusion products consist mainly of iron, and the stellar core collapses into a neutron star or a black hole.
Dialga has no evolution stage.
The first stage in boundary evolution is: '''definition.''' [Not delimination] >:-(