Asked By: Yaron WittensteinUpdated: 30th June 2021

Do quasars still exist?

Category: ResearchViews: 143
In the present epoch, many galaxies have exhausted their gas, and the expansion of the universe means that mergers are infrequent. That is not to say that quasars do not exist in the present epoch, just that their spatial density is so low that we do not have one in our close vicinity.

Considering this, what is the most powerful object in the universe?

That's about the same amount of energy in 10 trillion trillion billion megaton bombs! These explosions generate beams of high-energy radiation, called gamma-ray bursts (GRBs), which are considered by astronomers to be the most powerful thing in the universe.

Subsequently, question is, how fast does a quasar spin?

NASA's Chandra X-ray Observatory and the Hubble Space Telescope combine images of a distant quasar powered by a fast-spinning supermassive black hole. For the first time, astronomers have directly measured how fast a black hole spins, clocking its rotation at nearly half the speed of light.

How is a quasar formed?

A quasar is formed when a super massive black hole at the centre of a galaxy has enough material around it to fall into the accretion disc to generate the energy to power it. The only galaxies with enough material to create a quasar are young galaxies and colliding galaxies.

What is the brightest thing in the universe?

Although quasars appear faint when viewed from Earth, they are visible from extreme distances, being the most luminous objects in the known universe. The brightest quasar in the sky is 3C 273 in the constellation of Virgo.

Are quasars dangerous?

Although quasars are known to drive strong winds and jets of relativistic particles that can be dangerous in their own right, Forbes and Loeb looked at the damage caused by their light alone.

What is a blazar galaxy?

Blazars, a type of galaxy powered by a ginormous black hole and among the brightest, most energetic objects in the sky, are not unfamiliar to science. They belong to a class of galaxies known as “active galactic nuclei” or AGNs, a reference to the supermassive black holes that power them.

What is more powerful than a black hole?

The only thing more powerful than a black hole system is the set of black hole systems giving the fabric of spacetime its density. Without that density it would be 417 trillion light years to the horizon, not 46.85.

Could the Milky Way become a quasar?

The Milky Way contains a very dense region in its center, probably a supermassive black hole. Hence the answer is most likely yes, the Milky Way or some of its predecessor galaxies will probably have had quasars at their centers, at some period when consuming lot of material, and seen from appropriate direction.

Are quasars old?

For one, they are only seen far away. Thus, since the light takes billions of years to get to us from a quasar, the quasars are all very old. There are no nearby quasars, so there are no young quasars; quasars are not made during our era of the universe, only during an ancient era.

Are quasars stars?

Quasars are believed to produce their energy from massive black holes in the center of the galaxies in which the quasars are located. The word quasar is short for "quasi-stellar radio source". This name, which means star-like emitters of radio waves, was given in the 1960s when quasars were first detected.

Is a quasar brighter than a supernova?

In general, yes. A supernova or especially a hypernova can be as bright as a galaxy's core, containing 10 billion stars, like the Type 1A supernova SN1994d. The strongest quasars are as bright as thousands of galaxies, outshining a galaxy cluster.

Does the Milky Way have an active galactic nucleus?

Seyfert galaxies and quasars are galaxies with an active galactic nucleus. Most large galaxies have a supermassive black hole at their centres. The Milky Way currently doesn't have an active nucleus. It may have been active in the past when the galaxy was younger.

Can an active galactic nucleus stop being a quasar?

Naturally, active galactic nuclei can turn inactive: Over tens of thousands of years black holes run out of gas and dust to eat, so quasars dim and grow quiescent. There is nothing controversial about the idea that active galactic nuclei can become inactive.

Can a quasar escape a black hole?

Answer and Explanation: No, a superheated quasar cannot escape a black hole once it crosses the all important Schwarzschild radius, the point at which it is not possible for

Do black holes die?

Hawking radiation reduces the mass and rotational energy of black holes and is therefore also known as black hole evaporation. Because of this, black holes that do not gain mass through other means are expected to shrink and ultimately vanish.

Why are quasars so bright?

Quasars are believed to be powered by accretion of material into supermassive black holes in the nuclei of distant galaxies, making these luminous versions of the general class of objects known as active galaxies.

Why are quasars so far away?

Quasars are farther away from Earth than any other known object in the universe. Because they are so far away from us, it takes billions of years for the light they give off to reach Earth. The light stays the same, it just has to travel a long time to get to us.

What is inside of a black hole?

A black hole is a tremendous amount of matter crammed into a very small — in fact, zero — amount of space. The result is a powerful gravitational pull, from which not even light can escape — and, therefore, we have no information or insight as to what life is like inside.

What can escape from a black hole?

Black holes are sites of immense gravitational attraction. Classically, the gravitation generated by the gravitational singularity inside a black hole is so powerful that nothing, not even electromagnetic radiation, can escape from the black hole.

What is at the middle of the Milky Way?

At its center, surrounded by 200-400 billion stars and undetectable to the human eye and by direct measurements, lies a supermassive black hole called Sagittarius A*, or Sgr A* for short. The Milky Way has the shape of a spiral and rotates around its center, with long curling arms surrounding a slightly bulging disk.

What are black holes NASA?

A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

How can NASA see other galaxies?

Answer: Yes, you can see a few other galaxies without using a telescope! The nearby Andromeda Galaxy, also called M31, is bright enough to be seen by the naked eye on dark, moonless nights. The Andromeda Galaxy is the only other (besides the Milky Way) spiral galaxy we can see with the naked eye.


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