In a Large Sampling of Stars, the Largest Group Represented

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The Answer is Like the Sun, they are young enough to still have most of their initial hydrogen still notfused into helium; they will not evolve off the main sequence until the helium builds up a lot.Since hydrogen is by far the most abundant element and easiest to fuse, most stars are going touse it as their major fuel, as long as this supply lasts. Stars spend the vast majority of their lifespans on the main sequence.

In a Large Sampling of Stars, the Largest Group Represented

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