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Question 1: In the main sequence star stage, the star basically burns H, that is, it is condensed into helium, and only the region with the smallest center produces some heavy elements. At the end of the evolution of stars, different heavy elements will be produced due to different masses. The above stars are still in their prime.

Question 2: The life span of a star is related to its mass, ranging from 65.438+billion years to 65.438+billion years. There is no doubt that it should be in the stage of nuclear fusion at present. Nuclear fusion does not always produce heavy elements! That's too late!

Question 3: There should be no need to explain.

It's the first time to find a star who has lived for so many years. At present, there is little sodium in the sun.