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(However, quasar 3C 273, the first quasar to be identified, is 2.5 billion light-years from Earth, according to NASA. For instance, if the ancient quasar 3C 273, one of the brightest objects in the sky, was located 30 light-years from Earth, it would appear as bright as the sun in the sky. "Quasars are capable of emitting hundreds or even thousands of times the entire energy output of our galaxy, making them some of the most luminous and energetic objects in the entire universe," according to NASA. The brightest objects in the universe, they shine anywhere from 10 to 100,000 times brighter than the Milky Way. This energy exceeds the total of the light of all the stars within a galaxy.
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Quasars emit energies of millions, billions, or even trillions of electron volts. Quasars this young can reveal information about how galaxies evolved over time. Scientists observed the quasar, known as J1342+0928, as it appeared only 690 million years after the Big Bang. In December 2017, the most distant quasar was found sitting more than 13 billion light-years from Earth. Galaxies like the Milky Way may once have hosted a quasar that has long been silent. Most of the more than 2,000 known quasars existed in the early life of the galaxy. Thus, the farther away scientists look, the farther back in time they can see. Because it takes light time to travel, studying objects in space functions much like a time machine we see the object as it was when light left it, billions of years ago.
![quasar vs pulsar quasar vs pulsar](http://cdn.eso.org/images/screen/potw1747a.jpg)
Most quasars have been found billions of light-years away. "Quasars are thought to form in regions of the universe where the large-scale density of matter is much higher than average," astronomer Fabian Walter, of Max Planck Institute for Astronomy, said in a statement. The particles stream away from the black hole in jets above and below it, transported by one of the most powerful particle accelerators in the universe. While some dust and gas fall into the black hole, other particles are accelerated away from it at near the speed of light.
QUASAR VS PULSAR FREE
Although light cannot escape from the black hole itself, some signals can break free around its edges. Quasars live only in galaxies with supermassive black holes - black holes that contain billions of times the mass of the sun. Scientists now suspect that the tiny, point-like glimmers are actually signals from galactic nuclei outshining their host galaxies.