What is a quasar and what quasar is in essence

Quasar is the abbreviation of stellar-like celestial bodies, also known as quasar-like bodies, burly or quasar-like radio sources, and together with pulsars, microwave background radiation and interstellar organic molecules, they are known as the "four major discoveries" of astronomy in the 60s of the 20th century. For a long time, it has always puzzled astronomers.

Quasars are by far the most distant objects ever observed, at least 10 billion light-years away from Earth. A quasar is a celestial object with high luminosity and intense radio power that can be observed at extremely long distances. Quasars are much smaller than galaxies, but they release more than a thousand times more energy than galaxies, and their extraordinary brightness allows their light energy to be observed from a distance of 10 billion light-years.

A quasar is the brightest object in the universe, and it is 1,000 times brighter than a normal galaxy. For objects of such great energy, quasars are incredibly small. Compared to galaxies with a diameter of about 100,000 light-years, quasars have a diameter of about 1 light-day.

Astronomers generally believe that it may be caused by the fact that matter is pulled into a supermassive black hole at the center of the galaxy, which releases a large amount of energy (eruption rays). These distant quasars are thought to have been "lit up" when material was channeled into the black hole at the center of the main galaxy to add "fuel" when the early galaxies had not yet evolved to a more stable stage.

On November 8, 2011, with the help of the Hubble Space Telescope, astronomers photographed for the first time the disk-like structure that exists around a distant black hole.

Chinese name: quasar.

Foreign name: A quasar

Nicknames: Astral, Qui or Quasar-like radio sources.

Quasars are essentially high-luminosity objects observed at extremely long distances, and more than 80% of quasars are radio-quiet. Quasars are much smaller than galaxies, but they release more than a thousand times more energy than galaxies, and their extraordinary brightness allows their light energy to be observed from a distance of 10 billion light-years.

It is assumed that 10 billion years ago, there were more quasars. Quasars are a class of active galactic nuclei that are farthest from Earth and have the highest energy. Quasars and pulsars, microwave background radiation and interstellar organic molecules were once called the "four great discoveries" in astronomy in the 60s of the 20th century.

Quasar, an astronomical term, is an abbreviation of a stellar-like celestial body, also known as a quasar, a burly or a quaroid radio source, together with pulsars, microwave background radiation and interstellar organic molecules, and is known as the "four major discoveries" of astronomy in the 60s of the 20th century. For a long time, it has always puzzled astronomers.

Quasars are essentially distant objects with huge extragalactic energy.

Quasar is the abbreviation of stellar celestial bodies, also known as star-like objects, burly or chaotic bridge star radio sources, together with pulsars, microwave background radiation and interstellar organic molecules, known as the "four major discoveries" of astronomy in the 60s of the 20th century. Quasars are very distant celestial objects that have been observed by humans, and quasars with high redshifts can reach a distance of more than 10 billion light-years from Earth.

A quasar is a high-luminosity object that can be observed at extremely long distances, and more than 80% of quasars are radio-quiet. Quasars are much smaller than galaxies, but they release more than twice as much energy as galaxies, and their extraordinary brightness allows their light energy to be observed at a distance of 10 billion light-years.

Features:

The distinguishing feature of a quasar is that it has a large redshift, indicating that it is moving away from Earth at a rapid rate. Astronomers can see quasars because they emit enormous amounts of energy in the form of light, radio waves, or X-rays. Quasars have a star-like image on a photographic plate, which means that their angular diameter is less than 1.

Very few quasars have a faint nebula-like envelope, such as 3c48, and some have a jet-like structure.

There are many strong and wide emission lines in the quasar spectrum, including allowable and forbidden lines. The most frequent occurrence are the spectral lines of elements such as hydrogen, oxygen, carbon, magnesium, etc., and the helium line is very weak or non-existent, which can only be explained by the low abundance of helium. It is generally accepted that the emission lines of quasars are produced in a gas envelope, and the process is similar to that of ordinary gas nebulae.

The quasar's emission lines are wide, indicating that there must be violent turbulent motion in the gas envelope. Some quasars have very sharp absorption lines in their spectrum, indicating that the turbulent motion in the area where the absorption lines are generated is very small. The quasar emits strong ultraviolet radiation, so the color appears blue, and the energy distribution of the continuous spectrum of the optical band is in the form of a power law spectrum, which is the radiation intensity, and v is the frequency, which is the spectral index, which is often greater than zero.

Optical radiation is polarized and has the nature of source and never thermal radiation (see Thermal and Non-Thermal Radiation).

A quasar is a strange object with extremely high luminosity and is extremely far away from us. In spectroscopic observations, its spectral lines have a large redshift and do not resemble stars, hence the name quasar.

They are less than a light-year in size, yet a thousand times larger than giant galaxies about 100,000 light-years in diameter! The brilliant light makes us even far away at 100

They can be observed from hundreds of millions of light-years away.

Quasars are composed of a small, massive nucleus and an extra-nuclear halo of extensibility. The core radiates a tremendous amount of energy that excites the gas in the halo, creating strong and wide emission lines superimposed on a continuous spectrum. Most astronomers believe that this unusually large amount of energy** is provided by the gravitational energy released by the accretion of the surrounding material by the supermassive black hole at the center.

A quasar is a strange object with extremely high luminosity and is extremely far away from us.

A quasar, a star-like celestial body, is very far away from the Earth, and although it is smaller than other galaxies, it can release a huge amount of energy.

A quasar, which is a type of star that resembles a star. It's not a star, so a class is added to it, and it can also emit radio electricity. Some say quasars: it is produced by black holes.

But so far, scientists have not done enough research on this area, so most of it is just speculation.