How do stars change as they get older?
Bigger and Denser.
The Sun will burn through all of its hydrogen in 4.5 billion years and transform into a Red Giant, burning helium for a few million years. However, the process of converting helium to carbon is extremely unstable and requires a very fast reaction, which means a higher density of helium is needed.
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Stars change as they get older through a process known as stellar evolution. This process is determined primarily by the mass of the star. Low-mass stars, like our Sun, eventually expand into red giants as they exhaust their hydrogen fuel. They then shed their outer layers, forming a planetary nebula, and eventually become a white dwarf. Higher mass stars undergo more dramatic changes, eventually exploding in a supernova and leaving behind either a neutron star or a black hole.
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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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