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The spectra of the oldest stars show the most heavy elements.

User Alchitry
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Final answer:

The spectra of the oldest stars show the most heavy elements. The abundance of heavy elements in stars varies, with the Sun and most stars having about 1-4% of their mass in heavy elements, while in globular clusters and very old stars, the heavy-element abundance can be much lower.

Step-by-step explanation:

The spectra of the oldest stars show the most heavy elements. In the Sun and most stars, the abundance of elements heavier than hydrogen and helium is typically 1-4% of the star's mass. However, in globular clusters and some very old stars, the heavy-element abundance can be significantly lower, often less than one-hundredth or even one ten-millionth the concentrations found in the Sun.

User JonasV
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