Where did the universe's magnetic fields come from? 

 How the universe got its large magnetic fields has remained one of the stickiest outstanding problems in astrophysics. Now, researchers have proposed a novel solution: a giant "dust battery" operating when the first stars appeared.  

https://cdn.mos.cms.futurecdn.net/qtUtfSVgfDXaNypnP5XVa6.png

https://www.space.com/the-universe/where-did-the-universes-magnetic-fields-come-from