Hidden magma oceans could shield rocky exoplanets from harmful radiation

Rochester NY (SPX) Jan 19, 2026
Deep beneath the surface of distant exoplanets known as super-earths, oceans of molten rock may be doing something extraordinary: powering magnetic fields strong enough to shield entire planets from dangerous cosmic radiation and other harmful high-energy particles. Earth's magnetic field is generated by movement in its liquid iron outer core - a process known as a dynamo - but larger rock