A Magnetar (from magnet and star) is a neutron star with a very strong magnetic field. Their magnetic field is ~1015 gauss which is a trillion times more than that of the earth. They are the most magnetic objects in the universe. They are made just like a normal neutron star, when the core of massive stars collapses during the supernova explosion. While it is not absolutely clear how a magnetar is created instead of a normal neutron star. One theory suggests that to get this kind of magnetic field the neutron star must initially rotate between 1oo and 1000 times per second.
