Quasars

Quasars are the brightest objects yet to be discovered. The can be up to one trillion times brighter than Earth's sun. It is possible that they draw their energy from black holes.

447 Questions
Scientists
Quasars

What instrument do scientists use to study quasars?

telescope

259260261
Astronomy
Quasars

What do quasars emit?

Light and radio waves.

175176177
Astronomy
Quasars

Where are all the dead quasars?

The black holes that power quasars are still there. They are simply not as active as when they were young; pressumably because not as much matter falls into them.

173174175
Astronomy
Quasars

How are quasars different from galaxy?

A galaxy is essentially a large cluster of stars, ranging in size from several thousand stars, to several trillion.

A quasar is a small (in cosmic terms) object that emits enormous quantities of energy. Quasars consist of a supermassive black hole that is pulling in more mater than it can swallow. As the matter falls toward the black hole it is heated to billions of degrees and emits enormous amounts of energy.

147148149
Astronomy
Galaxies
Black Holes
Quasars

What is a quasar?

A quasi-stellar radio source, a quasar, is a very distant galactic nucleus that is extremely active as regards energy output. These sources just pour out electromagnetic energy in the form of light and radio waves. We also know that they are extremely far away because of the red shift associated with our observations of them. They are among the most distant objects we know, and they are moving away from us at very high speed, which is what gives their light the red shift. There is more information available at the Wikipedia article on the quasar, and a link is provide to the post. You'll find it below. Answer Imagine a light as bright as the light from a hundred galaxies. The light is being generated by stars and other material which are being dragged into a super sized black hole. As the material is being dragged into the black hole it is subject to huge friction which heats it up to millions of degrees. This kind of super powerful black hole is a quasar: the most powerful kind of object in the universe. By the time their light reaches us, they have long, long since sucked the life out of the galaxy they were feeding from.

A quasar will only exist in a really big galaxy... our galaxy, the milky way, isn't in any danger, because although we have a black hole at the centre of our galaxy; there is not enough matter to create the conditions for a quasar.


Many years ago, when modern astronomy was still in its infancy, astronomers looked at all the lights in the sky and tried to figure out what they were. Some were stars, bright points of light, and some were smudgy, smeared objects; almost cloudy-looking. Those got the label "nebula", from the Latin word for "cloud". But it was difficult to determine how far away the objects were; the relative brightness was one of the few clues.

Later on, Edwin Hubble realized that the universe is expanding, and that most of the other galaxies were receding from us. By measuring the red-shift of the stars or galaxies, astronomers were able to determine how fast the objects were going, and because of the nature of the expansion, had a new way of determining distances.

There was one BIG problem. There were stars that appeared to be point-sources, so they weren't galaxies or nebulae, but were receding too quickly - and therefore too far away - for any star to be visible. There was just NO WAY for a star to be bright enough to be visible from that far away. From their distance and their brightness, they would need to pack the brightness of a galaxy into the size of a solar system, which was clearly beyond our (then) comprehension.

Astronomers named them "Quasi-Stellar Objects", and because most people are too lazy to use three words when one will do, shortened it to "quasar".

It took decades for some agreement to be reached on what the objects are that are so bright and yet so distant, but the current thinking is that a quasar is the accretion disk of gas and matter heated to incandescence by the gravity of a supermassive black hole in the center of what may have once been an "ordinary" galaxy.
656667
Astronomy
Quasars

What is another name for the first quasars?

quasistellar object Technically, I shall tell you a better answer than the other one!At the very edge of the visible Universe scientists can see extremely bright and powerful objects called quasars. Quasars are about the size of our Solar System and produce more light and energy than 1000 galaxies. Think how incredible that is. A small object, not any bigger than our Solar System making so much power and light that it shines brighter than 1000 galaxies. Why are there no quasars near the Earth? The most distant objects visible in the Universe When we look at quasars which are 10-15 billion light years away, we are looking 10-15 billion years into the past. The quasars near Earth have died down long ago. What could produce so much Power and light? Quasars are probably super giant black holes, which are devouring entire stars. These black holes lie at the center of galaxies, and glow brightly as matter funnels into them.

535455
Astronomy
Quasars

Why are most quasars so far away?

That is a good question - astronomers are actively pursuing an answer. So the only answer is: no one knows.

444546
Science
Planet Mercury
Quasars

Who discovered salt first?

the firs ancient saltworks operation(more than 8000 years) has been discovered at the Poiana Slatinei archaeological site next to a salt spring in Lunca, Neamţ County, Romania. Evidence indicates that Neolithic people of the Precucuteni Culture were boiling the salt-laden spring water through the process of briquetage to extract the salt as far back as 6050 BC.[9] The salt extracted from this operation may have had a direct correlation to the rapid growth of this society's population soon after its initial production began

353637
Astronomy
Space Travel and Exploration
Quasars

When did the quasars form?

Quasars formed in the early stages of galaxy formation.

Quasars formed in the early stages of galaxy formation.

Quasars formed in the early stages of galaxy formation.

Quasars formed in the early stages of galaxy formation.

181920
Astronomy
Quasars

Where are quasars located?

Quasars are related to supermassive black holes, and those are located at the center of galaxies.

353637
Galaxies
Quasars

What makes quasars Different From other stars?

A star is matter being compressed (by the force of gravity) wich in turn heats the star and is the mechanism for Nuclear Fussion, subsequently the star expands ( gravity vs. heat). A Quasar on the other hand is not a star at all, it is, in fact dust wich is being pulled towards a Supermassive Black hole (usually at the center of a Galaxy), the dust being Super-accelerated, and rubbing (friction) against other particles, heats up to an incredible temperature and emits extra-ordinary bright light, which we have come to know as Quasars (accretion disc of dust around Supermassice Black hole)

333435
Astronomy
Galaxies
Quasars

Why are quasars considered as mysterious objects in galaxies?

Not as mysterious as they used to be. It is now known they are powered by gigantic black holes. Some details of how they work aren't known yet, though. For a start, it isn't known how a gigantic black hole could form so quickly in the first place - so that a young galaxy, that just formed a few hundred million years ago, already has a huge black hole at its core.

313233
Astronomy
Quasars

In what sense are quasars quasi-stellar?

A quasar is an abbreviated term for quasi-stellar radio sources.

Quasi - means something resembling or having a likeness to.

Stellar - means pertaining to, or characteristic of stars

The first "quasars" were discovered using radio telescopes in the late 1950s. Many were recorded as radio sources with no corresponding visible object.

So they became known as a radio source resembling something like a star, or quasi-stellar radio sources.

It was not until 1964 when they became known as quasars.

"So far, the clumsily long name 'quasi-stellar radio sources' is used to describe these objects. Because the nature of these objects is entirely unknown, it is hard to prepare a short, appropriate nomenclature for them so that their essential properties are obvious from their name. For convenience, the abbreviated form 'quasar' will be used throughout this paper.

-- Hong-Yee Chiu in Physics Today, May, 1964"

293031
Astronomy
Quasars

What evidence indicates that quasars are extremely distant active galaxies?

The evidence for the extreme distance is the extreme redshift. Also, in many cases, a coincidence has been found between a quasar and a galaxy.

The evidence for the extreme distance is the extreme redshift. Also, in many cases, a coincidence has been found between a quasar and a galaxy.

The evidence for the extreme distance is the extreme redshift. Also, in many cases, a coincidence has been found between a quasar and a galaxy.

The evidence for the extreme distance is the extreme redshift. Also, in many cases, a coincidence has been found between a quasar and a galaxy.

8910
Astronomy
Quasars

What do you would happen if quasars were found very near Earth?

We would already have noticed - or been killed. A quasar emits more energy than an entire (present-day) galaxy.

We would already have noticed - or been killed. A quasar emits more energy than an entire (present-day) galaxy.

We would already have noticed - or been killed. A quasar emits more energy than an entire (present-day) galaxy.

We would already have noticed - or been killed. A quasar emits more energy than an entire (present-day) galaxy.

789
Astronomy
Nebulae
Quasars

How does the spectrum help us to determine age and distances in the universe?

Age is kind of a mystery to me.

Distance, though...

Spectra show characteristic lines. They indicate the presence of specific elements, and they're always at the same frequency.

Except they're not. Very distant objects show the right pattern of lines, but "shifted" to the red to some amount. Since we know what the lines' frequencies are supposed to be, we can calculate the amount of this "redshift".

The amount of redshift tells us, indirectly, the distance, by comparison to other objects that we can actually measure the distance to using other techniques (redshift is proportional to distance).

This sort of relates to "age" in a way: the further away something is, the longer it took for the light to get to us, and so based on the distance we can calculate that the light we're now seeing must have actually been emitted x million years ago or whatever (physicists are cringing at this sentence, because relativity says there's no such thing as universal time).

252627
Astronomy
Quasars

How are quasars different from regular galaxies?

See related questions.

567
Astronomy
Energy
Quasars

Do Quasars have the energy of 5 million suns?

Quite a bit more than that. A typical quasar is several times brighter than an entire galaxy that has no quasar.

Quite a bit more than that. A typical quasar is several times brighter than an entire galaxy that has no quasar.

Quite a bit more than that. A typical quasar is several times brighter than an entire galaxy that has no quasar.

Quite a bit more than that. A typical quasar is several times brighter than an entire galaxy that has no quasar.

345
Astronomy
Planetary Science
Constellations
Quasars

What do scientist think about quasars?

Quasars are some of the most distant and luminous bodies we can observe. Since we measure them to be incredibly far from our own galaxy, in the order of billions of light-years, astronomers believe that they are several billions of years old as their light would have taken that long to travel to us. Astronomers think that they may be young galaxies as the appear to be incredibly bright balls of accreting gas that probably have black holes at their cores. Because quasars give off characteristic pulses of light at regular intervals, astronomers use them as "standard candles" to measure the redshifts (how quickly they are moving away from us) of other extremely distant objects.

123
Astronomy
Planetary Science
Stars
Quasars

Would a quasars 500 miles in diameter and revolve around the sun?

Quasars are believed to be gigantic black holes - millions of times the mass of our Sun. If we were anywhere near a quasar, it would be more accurate to state that the Sun (or the Solar System) revolves around the quasar, not the other way round.

Quasars are believed to be gigantic black holes - millions of times the mass of our Sun. If we were anywhere near a quasar, it would be more accurate to state that the Sun (or the Solar System) revolves around the quasar, not the other way round.

Quasars are believed to be gigantic black holes - millions of times the mass of our Sun. If we were anywhere near a quasar, it would be more accurate to state that the Sun (or the Solar System) revolves around the quasar, not the other way round.

Quasars are believed to be gigantic black holes - millions of times the mass of our Sun. If we were anywhere near a quasar, it would be more accurate to state that the Sun (or the Solar System) revolves around the quasar, not the other way round.

123
Astronomy
Quasars

Why do astronomers think that quasars represent an early stage of galactic evolution?

There are more quasars in faraway galaxies, i.e., in the distant past.

There are more quasars in faraway galaxies, i.e., in the distant past.

There are more quasars in faraway galaxies, i.e., in the distant past.

There are more quasars in faraway galaxies, i.e., in the distant past.

123
Example Sentences
Quasars

How do use quasars in a sentence?

Quasar is an acronym for quasi-stellar source. It is a 'star' or region with a very bright and regular electromagnetic pulse. There are several such examples the most notable is the Crab nebula.

So you could say 'the Crab nebular is a quasar'.

123
Astronomy
Quasars

How big are quasars?

A quasi-stellar radio source (quasar) is made by a super-massive black hole so it is about the size of the super massive black hole that made it.

192021
Planetary Science
Telescopes
Stars
Quasars

How are quasars formed?

See the following link: http://library.thinkquest.org/C005626/Quasars.htm

151617
Astronomy
Big Bang Theory (scientific model)
Quasars

Could quasars have existed before the Big Bang?

No, they could not have, because Quasars (quasi-stellar radio sources) are generally thought to be newly forming galaxies composed of huge quantities of "pre-stellar" matter surrounding a massive black hole. The Big Bang is described as the "origin of everything" as we see it in the universe. All matter and (so much more importantly!) all of space and time did not exist, and the Big Bang is the initiating act that produced all the energy and all the matter in the universe. According to the theory, we are not sure what existed before it happened. Current string theories predict an eleven dimensional space where part of it collapsed into four dimensions. And, when this collapse happened our universe was created. The Big Bang actually, according to the theory, only lasted about a trillion-trillionth of a second before it was large enough to produce Quasars.

181920

Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.