  While gravitation sustains the on-going evolution of the cosmos, it is
magnetism that breaks gravity's symmetry and that provides the pathway to the
non-thermal Universe. By enabling processes such as anisotropic pressure
support, particle acceleration, and jet collimation, magnetism has for billions
of years regulated the feedback vital for returning matter to the interstellar
and intergalactic medium. After reviewing recent results that demonstrate the
unique view of magnetic fields provided by radio astronomy, I explain how the
Square Kilometre Array will provide data that will reveal what cosmic magnets
look like, how they formed, and what role they have played in the evolving
Universe.
