If I ask you a question that if I take you to a tunnel, a kind of tunnel from where you can't return. What do you say then... Yes! BLACK HOLES. The ultimate monsters of our Universe. From where no one can escape even light can't. So, tell me a thing, if nothing is faster than light in this cosmos then how do other objects escape from there. Welcome to another Blog of Universe. And today our topic is none other than Black Holes, the most interesting topic in Space Science.



       Basically, a Black Hole originates after a star with big mass collapses in its core. Its gravity is huge and anything that enters here all the matter is put into a Single point called "Singularity". There is also a part in the Hole called "Event Horizon" from where nothing can escape. It is basically the last point of escape. There are two types of Black Holes.
                                           
                                            (i) Stellar Mass Black Holes
                                            (ii) Supermassive Black Holes

(I) Stellar Mass Type:- When a star (like 25 to 50 times bigger than our sun) dies, this type of Black Hole is created. The nearest to our Earth is 1600 Light Years. So, Yeah, happy that no Black Hole is near us.😅
(II) Supermassive Type:-  When you closely observe every single Galaxy, you may watch that in the core of every Galaxy there is a Black Hole. Yes, this is the Supermassive. And these sizes are huge. In our Milky Way Galaxy (M 80) there is a Supermassive Black Hole called Sagitarrius A Star. It is 4,000,000 times bigger than our Sun. Just Imagine! 

      Here, Time also plays a different role in the rest of the Universe. If there is higher Gravity then that's place's time is slower than others. That means if you sit in a Spacecraft and complete a round of a Black Hole, you think that only 1 or 2 hours is spent. But, actually, it's not. When you return to Earth you see that many years passed here. This seems so fascinating. Suppose you are a Father and when you return to Earth you see that your son or daughter's age is higher than yours.😂😂. In this concept, there is a movie named Interstellar. I recommend everyone to watch this movie if you have not watched it.
    
      The term Black Hole was first named by John Wheeler ( He is an American Astronomer) in 1967. And at last thanks to our Great Scientist Albert Einstein, Stephen Hawking, and many others to represent this mysterious thing to us. Till then stay safe. Good Bye...