This persnickety number determines the strength of magnetic fields. It figures in everything from motors and generators to ...

Earth's magnetic field originates in the outer core and extends out into the magnetosphere — a region of space that helps protect Earth from space weather.

Magnetic fields are everywhere in the universe. Of course, there's Earth's magnetic field, which deflects dangerous cosmic radiation, wiggles our compasses, and guides flocks of migrating birds.

The rapid movement of Earth’s magnetic north pole has puzzled scientists in recent years, as it has shifted from its usual ...

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.

The sun’s magnetic field is where the ‘stuff’ is. It can be dangerous. For the first time, scientists took nearly daily measurements of this mysterious solar region. Laura Baisas ...

Exoplanet habitability depends on a whole host of factors, with liquid water at the top of the list. It also requires a ...

The poles of the sun’s magnetic field are fading away. But don’t panic: it’s all part of our host star’s usual 11-year cycle of activity. Over the past couple of years, solar activity—as ...