Black Holes

Black Holes

             

           

              Hello friends, black holes are such dead stars which had mass at least 1.44 times greater than the sun. We should know about a star’s lifecycle, if we want to know about black hole. We have already published a blog on a star’s lifecycle. If you have not read, click here. In this blog we will discuss on advance properties of a black hole. So let’s start-

             

             Chandrashekhar, an Indian scientist, had shown that exclusion principle could not halt the collapse of a star more massive than the Chandrashekhar limit, but the problem of understanding what would happen to such a star, according to general relativity, was first solved by Robert Oppenheimer. His result suggested that there would be no observational consequences that could be detected by the telescopes of the day. Then the second world war started and Oppenheimer involved in atom bomb project. The picture that we know from Oppenheimer’s work is as follows:

           

                The gravitational field of a star changes the path of light rays in space-time from what they would have been had the star not been present. The light cones, which indicate the paths followed in space and time by flashes of light emitted from their tips, are bent slightly near the surface of the star. This can be seen the bending of light from distant stars observed during an eclipse of the sun. As the star contracts, the gravitational force of its surface gets stronger and the light cones get bent inward more. This makes it more difficult for light from the star to escape, and the light appears dimmer and redder to an observer at a distance. When the star has shrunk t a certain critical radius, the gravitational field at the surface becomes so strong that even the light can’t escape from its surface. Theory of relativity says that nothing can travel faster than light. It means nothing can escape from a black hole. The boundary of a black hole is called event horizon.

                

              

                The black holes are the point of infinite density. They curve space-time too much. There must be a point of singularity inside a black hole like at the time of big bang. Black holes are good medium of time travelling. You are not to go inside this, you are to stay in its event horizon. We should remember whatever we study about black hole is on the basis of theories. None has seen a black hole yet because light can’t escape from its surface. But in 2015, LIGO detected the gravitational waves, caused by the collapsing of two black holes about one million years ago. It is an evidence of black holes existence. But there some scientists are against the black hole’s existence. We will discuss on such theories in another blog.

                     If you are interested in astrophysics or in black holes, always visit here because we want you to learn the best.

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