What color star is the oldest?

From a yellow/white star.....expands and swells.
Become Red giant stars. The mechanism is
When the core of a star runs out of hydrogen fuel
state of gravitational equilibrium
and the energy from Nuclear fusion is gone.
causing the core to begin collapsing, the plasma shell
surrounding the core will be hot enough to start
fusion Hydrogen itself when fusion in this shell begins
This heat + energy from the shell makes the outer layer of the star.
greatly expanded and the surface expands
Hundreds of times greater than the star's original size.
When expanding to this size The energy at the surface of the star is very dispersed. Pg Slot เว็บตรง