What is...
...a "neutron star"?
Neutron stars are remains of stars...
...which have a mass of 1,4 to 3 times of our Sun
If they were smaller it becomes a "White dwarf"...
...and if they have more weight...
...a "black hole" will be born
When the hydrogen is complete fused to helium...
...the star collaps...
...and the electrons will fall in the nucleus...
....because of the huge compression
1 cubic centimeter has the same mass...
...as 35 Billion people...
...but only 20km in diameter...
