dust
what is the third stage of the star cycle
your job is enough for away
The "main sequence".
stellar nebula
No, it's a possible stage in the life cycle of a star.
You can tell by its size and/or color.
Protostar!
The young star stage because at that stage, stars are just burning, no interruptions or disturbances
Altair is still in the main sequence stage of a stars life. See related link for more information.
it doesn't.......
Formation of the star out of a giant cloud of gas and dust.
White Dwarf then Black Dwarf=Dead Star