The universe is soaked in weak-but-persistent magnetic fields. Despite decades of research, astronomers still aren't exactly sure where these magnetic fields came from. But new research suggests they almost certainly originated in the deep history of the cosmos.
Everywhere we look, we see magnetic fields. Sometimes, the magnetic fields are relatively weak, like the ones that thread their way through the spiral arms of galaxies. Sometimes, they're medium-strength, like Earth's. Other times, they are incredibly strong, like the ones powered by magnetars.
