It is based on the cycle of any star.
Prostar is like a small dim star, fusion ignition is the process in which the star grows and gets larger and hotter from the black dwarf into a star (this is the...
Brightness is a description of a stars luminosity as viewed from Earth. A star can be very hot and large but be so far away that it's brightness is not very bright - dim. A star can be quite cool but...