Evidence 2- The massive stars that are 10 times bigger than a regular star first run out of hydrogen, but they run out much faster than a regular star, then they expand and contract up to 8 times before exploding. If the star is average size, it does a similar thing, If the star is of average size, it will run out of hydrogen, but not as quickly as a massive star, then the star will expand, and then explode.
