... Gravitational wave search provides insights into galaxy evolution and mergers . ... Magnetic fields stronger than expected . ... The results of this study show that the magnetic fields within Milky Way-like galaxies have been every bit as strong over the last two-thirds of the universe's age as they are now&#8212and possibly even stronger then." ... If so, strong magnetic fields a long time ago are one of the essential ingredients that explain the very existence of our galaxy and others like it. ...