At the center of our Galaxy is a Black Hole

Black Hole is black… This is why it's difficult to detect. They can be detected when they suck matter, because then develops a lot of energy. Black Hole is a geometrically defined region of space and time. That has such a strong gravitational effects, warps space and time, that nothing (including particles and electromagnetic radiation such as light) can escape from the inside. For instance, the border region from which no escape is called the event horizon. Matter falling into the hole. It forms a disk that is heated by friction and so they are the most brightest forms in the Universe. If there are stars that orbit the hole then their paths can be used to determine the mass and location. Still little is known about Black Holes.

New findings have shown that in the center of our Galaxy “Milky Way” there is a hole that actually spins the Galaxy. In fact, we call it a supermassive Black Hole. There are various kinds of holes, from supermassive to small. It is proved that the rotation of each Galaxy in the center is powered by Black Hole. At the center of our Galaxy is a supermassive Black Hole of 4.3 million solar masses. It is assumed that all matter that enters the hole becomes disintegrated, through singularity. There is a possibility that on the other side matter is ejected or it is possible some other scenario.
 

Black Hole & Quasar

Quasar (coming from eng. word quasi-stellar radio source, QSO - Quasi-stellar object) is a celestial body that apparently looks like an ordinary star with a very pronounced shift towards the red end of the spectrum. Very distant celestial bodies radiate tens of times more energy than an ordinary Galaxy. It is believed that these are the core of active Galaxies of early Universe. Quasars and active Galaxies share many common characteristics. It is assumed that their energy comes from a supermassive Black Hole. For example, they "turn on and off" depending on their environment. The consequence of environmental effects is that can not be kept at that speed for 10 billion years. This is the explanation of why they are not in our immediate vicinity. After Quasar consumed all the gas and dust in his environment, it becomes an ordinary Galaxy.