Since ancient times, human beings have kept exploring the space. There are many wonderful celestial bodies in the universe, such as neutron stars. Studying them can not only satisfy our curiosity, but also help our daily life. The neutron stars are one of the wreckages formed by the supernova explosion. They are extremely dense and floats in space. They are the remains of a star after its death, but they are not completely dead. Because they are still active, they fire pulses, or even collide wi