The more massive the stars evolve, and vice versa. The theory which explains this fact also makes it possible to date them, but it led to give an age clearly higher than that of the observable Universe in the case of certain stars. The solution to this riddle involves a scenario that has just passed successfully tests.
The pioneers of du XXe century are at the origin of a . She was after this war and with the rise in power of and methods of analysis . Finally, it allows us to think about and describe the evolution of . This will depend in the first place on their .
The calculations then make it possible to estimate how long it takes for a star to become a or turn into
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