The magnetic field is thought to be largely generated by an ocean of superheated, swirling liquid iron that makes up Earth’s the outer core 3000 km under our feet. Acting like the spinning conductor in a bicycle dynamo, it generates electrical currents and thus the continuously changing electromagnetic field. Other […]

The magnetic field and electric currents in and around Earth generate complex forces that have an immeasurable impact on every day life. The field can be thought of as a huge bubble, protecting us from cosmic radiation and charged particles that bombard Earth in solar winds. Credit: ESA/ATG medialab Magnetic […]

This visualization shows the magnetic field around Earth, or the magnetosphere. Earth’s magnetic field origins are still a mystery, a new MIT study finds. Credit: Greg Shirah and Tom Bridgman, NASA/Goddard Space Flight Center Scientific Visualization Studio. The existence of a magnetic field beyond 3.5 billion years ago is still […]