Black Hole আসলে কি?|Mysteries of Black hole|What is inside the Black Hole?|Black Hole|কৃষ্ণগহ্বর কি?

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In our universe existence of black hole has been proven scientifically. In black hole gravity is so strong that even light can not escape out. Centre of black hole is called singularity. In singularity curvature of space time is infinite, mass density is infinite and flow of time becomes stopped. Einstein's General theory of relativity predicted existence of black hole mathematically.

From this video you are going to get answers of following questions:

1. What is black hole?
2. What is the mathematical equation of radius of black hole?
3. What is escape velocity?
4. Why escape velocity of a planet and star increases with its radius decreases?
5. Why contraction of a star can make a black hole?
6. How concept of black hole was first came?
7. How newton's law of gravitation can predict existence of black hole in universe?
8. How Einstein's General theory of relativity can predict existence of black hole?
9. What is schwarzschild radius?
10. What is event horizon of a black hole?
11. What is singularity of a black hole?
12. What will happen if any one cross the event horizon of a black hole?
13.কৃষ্ণগহ্বর কি?
Explained in Bengali.
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Science Around You
By Subhasis Ghosh.

Timestamps :
00:00 - What is escape velocity?
01:30 - Equation of escape velocity & concept of black hole.
04:18 - How concept of black hole came into mind.
07:01- Concept of General theory of relativity.
08:18.-Concept of black hole from general theory of relativity.
08:47 - Event horizon of black hole.
10:20 - Karl Schwarzschild Radius -Radius of black hole .


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General theory of relativity:
   • Einstein বলেছেন পৃথিবী কোন কিছুই আকর্ষণ কর...  


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