Black holes

Black holes are regions of space where gravity is extreme enough to prevent the escape of even photons( fastest moving particles in universe) . We can't able to see them directly because they don't emit anything except Hawking radiation(not confirmed ,under research) .                                                                                       Recently , scientists find a monster Black hole whose mass is 700 trillion solar masses and it is as luminous as 10,000 Suns . Now,you have a question in your mind how Black hole can shine? In reality, Black hole doesn't shine but it is the disc of gases which revolve around the Black hole and due to friction and high speed rotation it's temperature rises and make Black hole horizon shine.                                                                                       According to the prediction of many scientists a super massive black hole "Sigitarrius A*" is present at the centre of our milky way galaxy, it is emanating vast amount of x-rays, but indirectly it is also responsible for the existence of life on earth. Due to it's immense gravity all stars in our milky way revolve around it and forms a system of stars which we calls a galaxy. The astronomers have looked back more than 12 billion years to the early ages of the Universe , they find a black hole known as J215728.21-360215.1(officially named by NASA) which is estimated to be the size of about 20 billion Suns with a one per cent growth rate per Earth year.



Real image of a black hole

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