Black Holes and the story of their two images
B lack holes are very mysterious things in the universe. Before the discovery of black holes they were just mathematical construct of Einstein's General Relativity also known as Einsteins Theory of Gravity. According to this theory, when the gravity is strong enough, the singularity will form. In other words singularity is the point where some property is infinite. That is a region with a infinite energy density. When this happens, there is a region or notional boundary which is no particles even no light or any other radiation can escape. This region is called the event horizon of a black hole. Although we cannot see the black hole's event horizon due to no light is emitting, there is a way of watching at glowing gases around the black hole. It creates a bright ring like structure. Although that is the case the surrounded gas and dust particles prevent the sight of seen it. Black holes cannot be seen from optical telescopes and only we can see by using radio telescopes. So low...
