Hello everyone !
 
In this video you will be able to know about the so-called
phenomenon Black Holes.
What's in fact a Black  ,how it is formed
and is there any such thing in our galaxy?
 
A black hole is an  intensive celestial body
with extrem gravity  ,to whom nothing
even the light can escape ,
In its center  is " singularity"
a part when mass compressed up to zero volume The outer boundary Horizon
represents the point beyond which everything is absorbed in the cosmic swirl
How is a black hole formed
In fact exist so many theories  about this phenomenon
one of them is that when a giant star
reaches the end of its  life and its ready to
explode in supernova
it spends all its nuclear fuel
and then it falls on its gravity
When a star is near of its death, the nuclear
reaction of conversion  from Hidrogen to Helium stops
and then formed the new reaction
converting Helium to Carbon
known as exothermic process
then the Carbon convert to Oxygen
Oxygen convert to silicon  and the silicon convert to iron
 
That is the point when nuclear fusion stops
the giant core of iron  continues to be formed
up to the point when the star explode on supernova
In the universe exist hundreds of
thousands  black holes
is there any such thing in our galaxy?
Of course  ,it is the black hole SGRA named named after the Sagittarius constellation
which is millions of light  far from the Earth
so the probability that it suck the Earth is  1 /trillion
 
 
