The magnetar 1E 2259+586 shines a brilliant blue-white in this X-ray image of the CTB 109 supernova remnant. Magnetars possess the strongest magnetic fields known to science — more than 100 times stronger than typical pulsars. CTB 109 lies about 10,000 light-years away in Cassiopeia.
ESA/XMM-Newton/M. Sasaki et al.