as the object approaches the center of
the black hole it starts to reach the
speed of light until it becomes a part
of singularity, wait minute what is a
black hole after Katie Bouman and her
colleagues captured the first image of a
black hole the whole world's attention
was brought to these mysterious space
objects more and more people started
asking questions like how does a black
hole work what is an event horizon what will happen if I cross the event horizon well the
thing is scientists have been wondering
about these questions for almost five
decades now and now today in this video
I will try to explain some of the known
properties of a black hole well let's
start with the preliminary question how
do black holes form to know this well
first have to understand how stars work
specifically how they die the energy
that stars release in the form of
radiation pushes against gravity making
a delicate balance between these two
forces however when massive stars fuse
enough elements until they reach iron
which does not release any energy the
balance between gravity and radiation is
broken resulting in the collapse of a
star the massive star collapses it can
result in two things first is a neutron
star if the core of the collapsing star
is between about one and three solar
masses the newly created neutrons can
stop the collapse leaving behind a
neutron star starts with cores that are
more than three solar masses will
continue to collapse into stellar-mass
black holes if we looked at a black hole
what we would be seeing is its event
horizon so where is the hole part of
the black hole and that's when
singularity comes into play well we
don't know much about singularity except
the fact that it's located in the center
of the black hole and contains a huge
mass in an infinitely dense place at a
singularity space and time cease to
exist as we know them and current laws
of physics are broken isn't that mind blowing? now you may start wondering is there an
end to a black hole?
well according to Stephen Hawking one of
the greatest theoretical physicists of
all time yes the thing is empty space in
reality is not empty it is full of
virtual particles that spontaneously
appear and annihilate each other however
when this happens near a black hole one
of the particles get swallowed by the
event horizon while the other one
escapes due to quantum effects because
of this black hole looses a small amount
of its energy and therefore some of its
mass if we refer to Einstein's equation
this process known as Hawking radiation
happens very slowly at first but gets
faster as the black hole gets smaller
eventually the black hole evaporates
this process happens very very slowly
when the last black hole evaporates none
of us will be here to witness it
