Hello Guys! So today let's talk about some
awesome stuff.
Black holes. In the normal life of a star
, there is a constant tug of war between gravity
and the outward pressure of the star.
The outward pressure of the star is due to
the nuclear fusion going on in the star. So
throughtout the life of a star, the gravity
and the outward pull exactly balance out each
other. That's why the star is stable. As the
star reaches end of its life , gravity wins
the tug of war and the material in the star
gets compressed due to it's own gravity. The
massive the star,the greater the force of
gravity. For a small star , even though the
gravity collapses the material inside it.
The repulsive force between the electrons
in the star halts the collapse inside the
star and this star eventually dies peacefully.
These type of stars are called as White Dwarf.
But now let's talk about the massive ones.
The massive stars explode into a supernova.
All that remains is the star's core. If the
Star's core is about 2.5 times the mass of
the sun then no known replusive force inside
the star can hold the gravity, completing
collapsing the core to a Black hole. From
the perspective of a collapsing star, the
core contracts to a point which has virtually
zero volume with infinite density and this
point is called as Singularity. So how far
can u compress something which may reach it's
ultimate breakdown limit with an object that
forms a black hole. So this limit is called
as Schwarzschild Radius. It is a radius of
a sphere such that if all the mass of an object
were to be compressed in that sphere then
the escape velocity of the sphere is equal
to the speed of the light.
Escape Velocity.
For example, if You have to launch a rocket
from earth, you have to launch it with a velocity
which is equal to the escape velocity of the
earth so that it can escape the Earth's Gravitational
pull. For a black hole, this Schwarzchild
Radius is its event horizon. That's why you
cannot see anything inside the event horizon
as the light itself cannot travel back out
of the event horizon ,as the Escape velocity
passed from the Event horizon is more than
the speed of light. So if we want to make
the Sun, a Black hole, we have to compress
all it's mass to a region which is about 3km,
then our Sun will become a Black hole. So
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Stay Curious! Stay Awesome
