Black Holes

        Space is dark and also empty. In it also exists, dark and dense bodies known as “Black Holes”. These are places or objects where force of gravity is so large that it does not allow even light to escape. Black holes may be stationery or moving but the unusual property is regarding space and time. Time is dilated as we go near a black hole and vanishes inside it. 

Depending upon the mass of black hole it is basically classified into the following- 

• Miniature black hole 
• Siellar 
• Supermassive 

     Black holes cannot have charge owing to the fact that due to high gravitational force it will attract the charges of opposite polarity and neutralize them. It is very difficult to predict what is there inside the black holes as the communication is ceased due to trapping of signals by the strong gravitational force. 

       Black holes are born due to gravitational collapse i.e. when the celestial bodies cannot withstand their own compressing force of gravity. They grow in size by capturing/trapping other bodies coming close to them. When two black holes collide, they form a large black hole which is another main cause of their growth. 

      Previously it was thought that death of black hole was impossible since nothing, even light cannot escape from it. But the eminent scientist Stephen Hawking theorized black holes emit some radiation and at some point of time it will disappear.

BY: Molla Ramizur Rahman

Dark Matter

      For years the physicists struggled for creating an image of the outer space through computers but failed to develop a stable model. The model was being developed in order to see whether the data that we collected is accurate or not. Also the purpose was to discover a black hole. A Black Hole cannot be detected by using instruments in space. Every time the outer space was simulated, every time it fell apart. There was something that was missing, but what was that ? The answer was The Dark Matter.

     What is this new thing? Is it an element or planet or a star? This new thing has been defined as matter but its type is still undefined. A matter is defined to have mass and volume; so does dark matter. Dark Matter constitutes a large amount of the total mass of the universe. This matter cannot be seen, then how can it be detected? The only known way today is by weighing the matter. When values were substituted with dark matter in mind, it gave astonishing result, a stable space. But what was in this matter that we were not able to achieve a stable universe? Using the laws of conservation, the mass of celestial bodies was calculated and equated for analysis, but due to lack of sufficient strength to hold the bodies together in the system, the space was tearing apart again and again which is not true. To resolve this missing mass, the concept of dark matter was introduced.