This ppt describes the reason behind the black holes and what happens after a black hole phase.

1. Sudeeksha Koricherla
R.no: 19PQ1A0533

2. Contents
• Introduction
• What are Black Holes?
• How are Black Holes created?
• Types of Black Holes
• Parts of Black Hole

3. Introduction
• Albert Einstein first predicted the existence of black holes in
1916 with his General theory of relativity
• Later American astronomer John Wheeler named it “Black
Hole” in 1967
• Today: NASA Telescopes have discovered evidence for Black
Holes through-out the universe
• There are millions of Black Holes in
our milky way galaxy

4. What are Black Holes?
• “A Black Hole is a great amount of matter packed in very
small area. It is a place in space which has big gravitational
field, that nothing, not even light can escape”.
• Scientist can directly observe black holes, and the only way
to perceive them is by detecting their effect on matter
nearby.
• As Attracted matter accelerates and
heats up, it emits X-Rays that radiate
into space
• They emit powerful gamma rays
bursts, which devour nearby stars

5. How are Black Holes created?
• In a way, black holes are created when a star stops existing
• Inside a star, the nuclear fuel of a star and its own gravity collide
(this creates stability)
• Once it runs out of nuclear fuel, gravity compresses the star
• Then, the outer layers explode into a
supernova, and the centre collapses
inwardly
This only occurs in big stars, which are atleast 10 times bigger than sun

6. Types of Black Holes
I. Miniature black holes II. Supermassive black holes

7. Parts of Black Hole
Event Horizon Singularity Accretion Disk

8. The Ergosphere Photon Sphere
Schwarzschild Radius Jets of Gas

10. Curious facts about Black holes
• They can explote (only the smaller ones)
• They fire intergalactic Death Rays
• It is not their mass, it is their size what matters
• Black holes disort Space-Time
• Objects appear to ‘freeze’ near a Black Hole
• Black Holes eventually evaporate over time