This image may not be used by or to promote the arms, nuclear power or tobacco industries or any religious organisation, or in any discriminatory way, or to imply the endorsement by ESO of any product, service or activity Illustration showing a gamma-ray burst and supernova powered by a magnetar. A magnetar is a type of neutron star with an incredibly strong magnetic field (a million billion times stronger than that of the Earth), which is formed when certain stars undergo supernova explosions.