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1. Black Holes Presented by- Jyotsana Sharma Btech (hons.) CSE RA1803A10

3. History-- The idea of preventing light from escaping as described by general theory of relativity was given by John Michelle. Even the British astronomer Pierre -Simon Laplace came with the same conclusion.

4. The intense gravitational field left when a giant star collapses. It is called a black hole because not even light can escape. Objects too heavy to be neutron stars collapse to black holes. Formation-

5. Formation Continued… As the mass increases, so does the gravitational pull. If the gravitational pull is such that even light can escape , then a black hole is formed.

6. Gravity deforms space time Diagrammatical representation

7. Gravity bends the path of light

8. Event horizon The point at which no light can escape.

10. Falling into a black hole Falling into a black hole gravitational tidal forces pull spacetime in such a way that time becomes infinitely long (as viewed by distant observer). The falling observer sees ordinary free fall in a finite time.

12. Seeing black holes

14. 1-Accertion disks and gas jets. 2-Strong Radiation emissions 3-Gravitational lensing Techniques for finding black holes

15. Types of Black Holes-- 1-Supermassive Black holes. 2-Stellar- mass black holes. 3-Intermediate mass black holes.

16. Advantages and Disadvantages-- They can be significant in this way: 1-Individual modes may dominate the time evolution of some perturbation, and a whole set of them could be used to completely describe this time evolution. The disadvantages are that – 1-when a black hole evaporates information is really gone. 2-Due to this there is trouble in energy conservation. 3-Invariance in time predictability.

17. References--- 1-www.google.com. 2-www.wikipedia.com. 3-Anatony on Black holes.

18. THANK YOU ANY QUESTIONS???? ???