What happens to stars once they have used up all their hydrogen?
It will burn the product of burning Hydrogen if it is dense enough.
After the hydrogen fuel runs out, if the star is dense enough to burn helium, it will do so into other heavier elements; if not, it will explode violently in a supernova if the star is much larger than our Sun, or it will shed its outer layers into space after 4.6 billion years.
Helium can typically be burned into heavier elements by stars the size of the Sun or larger.
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After depleting all of their hydrogen, stars undergo different transformations based on their mass: higher-mass stars go through a series of nuclear burning stages, forming elements up to iron; when they can no longer sustain nuclear fusion, they explode in a supernova, leaving behind either a neutron star or a black hole. Low to medium-mass stars become red giants, shed their outer layers, and form planetary nebulae before the core collapses into a white dwarf.
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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.
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.
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.
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.
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