these stars become immortal, staying forever young, occupying a new, distinct, observable region of the HR diagram.” John also noted that lighter stars might become very ‘puffy’ and lose ...

The most prominent feature of a Hertzsprung-Russell diagram is the main sequence: a single bold streak that reaches almost from corner to corner, which encodes the life story of most known stars.

This diagram tracks stars of all masses through their evolution from main sequence hydrogen-burning stars to dense cosmic remnants. However, new research has revealed that some stars at the heart ...