what is magnetar and neutron star

What is a magnetar?

As per NASA, a magnetar is a neutron star, “the crushed, city-size remains of a star many times more massive than our Sun.” 

The magnetic field 

of such a star is very powerful, which can be over 10 trillion times stronger than a refrigerator magnet and up to a thousand times stronger than a typical neutron star’s.

Neutron stars are formed

when the core of a massive star undergoes gravitational collapse when it reaches the end of its life. 

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This results in the matter being so tightly packed that even a sugar-cube sized amount of material taken from such a star weighs more than 1 billion tons, which is about the same as the weight of Mount Everest, according to NASA.

Magnetars

are a subclass of these neutrons and occasionally release flares with more energy in a fraction of a second than the Sun is capable of emitting in tens of thousands of years.