What is a quasar? Is it a galaxy? Or is it a black hole? What if I say it's like a combination of both with some differences? Let's get to the topic. quasar is an extreme light emitting active galactic nucleus. It was called as quasisteller object, there after named as quasar, a compact region at the center of a galaxy that has a much higher than normal luminosity. These are known as the most energetic and luminous objects in the universe. It emits radiation in all directions. It doesn't only emit radiation, it also gets fueled by the accreted material around it. A quasar forms when material falls into the accretion disk around a supermassive black hole at the center of a galaxy. quasars show the locations of supermassive black holes which grow by accretion of matter. The largest known quasar is estimated to consume matter of 10 Earths per second. Let's discuss main types of quasars. Radio-loud quasars, these contain powerful jets, only 10% of all quasars known are radio-loud. Radio-quiet quasars, these lack-powerful jets, 90% of all quasars known are radio-quiet. Red quasars are the quasars that are mostly radio-quiet or loud quasars which look red in color and which doesn't have much luminosity. Last but not least, micro-quasars are smallest quasars ever known, one of these can light up our mother Earth completely. Vars can emit light of a trillion times brighter than the light coming from our sun. They contain massive black holes and they may represent a stage in the evolution of some galaxies. When two quasars collide, it will actually be two supermassive black holes colliding and result to destruction of the surroundings in form of gravitational wave fluctuations. It is believed that when Andromeda Galaxy and our own Milky Way Galaxy collide after four billion years, they might get their cores united and may form a quasar which will be brighter than many known quasars. A quasar has black hole that draws in matter from the surrounding space. After a quasar is done accruing the surrounding gases and matter, it cools down and turns into a normal galaxy. It is believed that quasars are powered by accretion. The accretion disk is combined with gases, matter, nebulae and other materials. Quasars are destructive, they shut down the formation of stars by a process called feedback, they release jets, strong radio emission, radiation and energy which is strong enough to wipe out young stars in their galaxies. This destruction of quasar is quite helpful for stabilization of universe, this prevented many star formations and saved the surroundings from supernovae blasts that could cause havoc in the entire space. Its strong gravitational field causes it to radiate across a wide range. Its core temperature may be hotter than 10 trillion degrees. The brightest quasar in sky is 3C273, it is in the constellation Virgo. It was found in 1900s by an Australian radio station where they pointed anti-nass for the first time towards space, at the time they found many strange radio waves, one of these strange things are quasars. Many scientists believe that quasars are supermassive black holes with an accretion disk around. Here's an example of how stars get pulled by a supermassive black hole. Thank you for watching and make sure you hit the like button if you find this informative and consider subscribing to the channel for more such space related content, there is a lot more content coming, click the bell icon to receive notifications of our videos, and if you have any suggestions or do about the topic, mention them in the comments.