How many quasars are there in the universe?

Answer 1

Estimates are around 50,000.

There are more quasars than have been observed that are not as bright as the ones that have been observed; estimates based on the density of galaxies come to about 50,000. The known quasars are extremely distant objects over 10 billion light years away.

It is believed that quasars can only form in young galaxies and when galaxies collide. Because of the enormous energy output, quasars are relatively short lived objects because a lot of material must fall into the supermassive black hole at the center of a galaxy.

Supermassive black holes are known to be present in the centers of many galaxies, including our own, which may have originated as quasars in their early stages of development.

Since the known quasars are so far away, what we are witnessing are young galaxies as they were billions of years ago, by which time they will no longer be quasars, and new quasars could be created as a result of galaxy collisions.

Therefore, even though there might be a good number of quasars that are visible, there won't be many at this time, if any at all.

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Answer 2

Although the precise number of quasars in the universe is unknown, estimates place the number of observable quasars in the observable universe between 100 billion and a trillion.

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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.

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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