What is the difference between a black hole and a quasar?
A black hole emits no light while quasars can emit light a trillion times brighter than that of our sun.
A quasar's precise nature is unknown, but they all appear to exist near a black hole, which supplies the quasar with a significant amount of energy.
Because of their extreme distance from us, it is possible that quasars were an anomaly of the early universe and that even though they may not exist now, we are still able to detect them. All known quasars are located billions of light years away.
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In summary, while both involve black holes, a quasar is an extremely luminous and energetic object powered by a supermassive black hole at the center of a galaxy, and a black hole is the collapsed remnant of a massive star. On the other hand, a quasar is an extremely luminous and energetic phenomenon powered by the accretion disk around a supermassive 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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