We all must be very much familiar with the term ‘Black Hole’. If yes, then you will enjoy this article and if no, then you definitely will enjoy this article. So, as the title says, ‘A source of Destruction or Evolution?’, well, before reaching to anything and stating anything, let us first discuss about Black Holes.
What is a Black Hole?
Renowned scientist Stephen Hawkins gave his theories about time and black holes, in which he stated facts that concluded that the black hole is indeed the end of everything, that everything in this so called universe will merge into a black hole leaving nothing but cosmic dust but also the fact that this universe is the gift by none other than a Black Hole.
Black hole is considered as large holes having a very huge amount of gravity, enough to suck anything that crosses it. The gravity is so strong that none particle, even electromagnetic radiation such as light can leave the black hole, once it has entered in it. This is also stated that inside a black hole, there is no significance of time. In movies, whenever there is a black hole, it is surrounded by a sparkling golden circle, by which, we are able to detect any black hole. This circle or the outer boundary of black hole is known as ‘Event Horizon’.
The theory of general relativity states the facts that when a sufficiently large mass is concentrated in a small volume, creating a heavily dense body, it causes the deformation of the spacetime, causing the birth of a black hole.
The birth of black holes takes place in the event when an object of heavy mass such as a star collapses at the end of its life cycle. The black hole, thus remains and gets bigger by absorbing other objects. When a black hole has absorbed sufficiently large amount of mass, it becomes super massive black hole which comprises of millions of solar masses. It is in general, assumed that such type of supermassive black holes is present at the very centers of the most galaxies.
The presence of a black hole can be inferred by its event horizon which it the cause of its interaction with other objects and Electromagnetic radiations. The matter that falls in a black hole creates an external accretion disk, which gets heated by the friction between the two, this combination of heat and light is vast enough to be seen many light years away.
Given the extreme and complex characteristics of black holes, it was long questioned whether such objects or bodies could actually exist in universe or whether they were merely pathological solutions to Einstein's equations. Einstein himself once wrongly thought about it that the black holes would not form, because he held the fact that the angular momentum of collapsing particles would stabilize their motion at some finite radius.This led the community of general relativity to dismiss all the results to the contrary for many following years. However, a minority of relativists who believed this, continued to contend that black holes are real and were physical objects,and by the end of the 1960s, they had persuaded the majority of researchers with the very fact that there is no obstacle to the formation of an event horizon.
In cases, when other stars orbit a black hole, their trajectory can be used to determine the black hole’s mass and location. In this way, astronomers have identified numerous small black holes in our solar system and have revised a radio source known as Sagittarius A, present at the core of milky way, which is considered to be containing a supermassive black hole of 4.3 million solar masses.
Considering the fact that big bang was none other than the collapse of a supernova, it must have also caused the creation of a black hole and hence it becomes the fact that the creation of universe indeed started from a black hole, but since there are the existence of supermassive black holes, we can say that one day will come when our galaxy will be absorbed by such a black hole and thus, it will be the end of us.