Black Holes, Gravity and Time (Part - 2)

Black Holes

 

              This is a Black Hole. You might actually know it. Black Holes are a natural beauty but they might be brutal if we go near one. Black Holes are totally strange, we just observe them and bring out theories, this is what science is all about. One such theory is about Hawking Radiation given by a renown scientist - Stephen Hawking. This Hawking Radiation is given out by a black hole all the time due to changes which occur in the atoms of the black hole. 

              And this might be the reason for a black hole to die. How? Black holes always release radiation and at one point of time there is nothing to radiate, so the mass totally collapses and give out energy, bursting out all the contents of it. How do we actually see Black Holes?

              The simple answer to this question is through a telescope. But, there is a galaxy called The Andromeda Galaxy about 2.5 million light-years away from our, Milky way Galaxy. If we are ever to know what is behind this galaxy, how would we know? Before answering this question, let us know what is Gravitational lensing. 

ESA - Gravitational lensing

             This is what is called gravitational lensing. The object to the left is a black hole, the middle contains a galaxy, and there we are at the bottom right observing the black hole. The light rays coming from the Black Hole bends when it reaches to the edge of the galaxy due to gravity. After bending it throws the light backward as it travels through the edges of the galaxy. And we observe those light rays coming from a Black Hole.

              In a nutshell gravitational lensing is where gravity distorts or changes the path of the light rays. This occurs in every object in the universe you, me - as we create gravity, but light needs a large amount of gravity to distort itself. Well, this is pretty much how we observe every thing behind anything in the universe.

              How do we detect black holes? As many of you might answer, we just detect that the light revolves around a black hole. But this is not totally right. A few of the black holes have light revolving around them, this is because they eat up a star. But in rest all cases, the black hole is just black. 

Why Black Holes Can't Shrink | What is Hawking's Area Theorem?

               This is a Black Hole without light revolving around it. As you might observe, gravitational lensing occurs near a black hole. And this might be the answer to the question. There is another way to detect a Black Hole. The gas particles around the black hole, spin around it with a really high speeds, due to which energy is released in the form o light, here X-rays, and these X-rays reach earth and is detected from there. 

              Do Black Holes get any bigger? Yes, they do, by absorbing the mass in its surroundings. Why is a Black Hole black? It is because, Black Holes do not reflect back light, as nothing in this universe escapes a black hole. Are black holes made of dark matter? It might be true that black holes are made of dark matter, but no one really knows the answer to it. 

 

                                                             -Blog by Daksh Bawgiker 

Comments

  1. Jai Tech Tube19 August 2021 at 15:02

    Nice blog, could you tell more about dark matter and tachyons

    ReplyDelete
    Replies
    1. Daksh Bawgiker19 August 2021 at 19:22

      I've already uploaded a post on dark matter

      Delete
    2. Daksh Bawgiker19 August 2021 at 19:24

      Everything about light and topics related to light will be explained in quantum theory( which will be uploaded soon)....... Stay tuned

      Delete

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