We talked about Black holes before
There I had to mention about Neutron stars
Then you asked me tons of questions about that
So this video is about Neutron stars
We already know the birth of black hole
When a massive star died with a supernova, the remaining matter condensed to a singularity creates a black hole
If the matter remaining is just not enough to make a singularity, that will create a neutron star
That means neutron star is very close to a black hole
So now you must have figured out that neutron stars also massive collection of matter
It's diameter is usually around 25 Km
But it's mass could be 3 times as Sun
1 cubic cm of neutron star could weigh about mount Everest
Neutron stars has a massive gravitational field
If you drop something to neutron star, that will get accelerated to very high speed
But that will never be equal to the speed of light
That means there is no event horizon
So it can emit electromagnetic waves
We can observe it will scientific instruments
Due to this massive gravity it has a very smooth surface
If there is a mountain it will be no more than few millimeters 
And it's atmosphere is compressed to few inches
It is a plasma
Temperature is about 1,000,000 K
Sun's surface temperature is about 5000-6000 K
So you can picture that!!
 The crust of neutron star is iron atoms
Electrons can move around them
If you dig deep, it's only neutrons and protons same as a atomic nucleus 
If dig further, there is only Neutrons
Even to date our understanding is limited about core of neutron star
Since quarks here are highly dense and under great pressure, many scientists believe that it's a quark gluon plasma
 For many centuries we observe universe with light
But it's a small slice of electromagnetic spectrum
With the advancement of science we could observe universe with IR, X-rays, Micro waves, Gamma rays etc
For that we are using Radio Telescopes
We observe something very mysterious, in early days of Radio telescopes 
Many cosmic objects are emitting electromagnetic waves
Scientists could observe that some objects are emitting electromagnetic waves in certain intervals
Many cosmic objects are emitting electromagnetic waves
Scientists could observe that some objects are emitting electromagnetic waves in certain intervals
The only explanation they had was Aliens!! 
Since this is a revolutionary idea, they dig deep in to this
Neutron starts are rotating very fast
Somethings it could be high as 25% of speed of light
Hence it has a very strong electromagnetic field
It's millions times stronger than earth
That's emitting beams of electromagnetic waves across universe
These beams of electromagnetic waves sweeps though Earth in certain intervals 
This could vary from few milliseconds to few seconds
Radio telescopes detected these beams of electromagnetic waves
When neutron star is behaving like this, we call it a Pulsar
And this proved that it's not Aliens!! :(
Neutrons stars are the closest situation we know to a black hole
But it's observable
By studying neuron stars, we might be able to understand black holes better
You may know many things about this
We'll discuss them in the comment section
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