Magnetic fields are a fundamental part of the universe. They govern how small particles – the building blocks of planets, stars, and ultimately galaxies – move through space. We still don't know how magnetic fields came to exist in the universe, but we do know they're everywhere. Earth itself has a magnetic field that compasses and migrating birds respond to. With radio telescopes, astronomers can use the light from distant galaxies to illuminate these otherwise invisible areas in space. In our