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What does iron do in the stars and sun?

Answer 1

It serves no purpose in stars and causes them to die

When a star can no longer fuse elements for energy, iron—the heaviest element—builds up inside the star until it is released during a supernova.

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Answer 2

Olivia Aldridge

Iron is a key component of stellar evolution in stars, including the Sun. Iron is created during a star's lifetime through nuclear fusion processes in the cores of massive stars. When a star runs out of nuclear fuel and reaches the end of its life cycle, iron builds up in its core and signals the beginning of the star's demise, which can result in a supernova explosion in massive stars or a slow collapse in lower-mass stars. During these processes, iron acts as a catalyst for the last stages of nucleosynthesis and its presence affects the dynamics of stellar explosions and the subsequent heavy element enrichment of the interstellar medium.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.