Fossil stellar magnetic field

Imagine you have a friend who has a toy car. When your friend plays with the car, it creates energy that makes the wheels spin. This energy is like a magnetic field that helps the car move.

Now, imagine a really big car, like a star in space. This star also has a magnetic field that helps it move and do things in space. Scientists sometimes call this energy "fossil" because they can study it after the star has died, like finding a fossil of a dinosaur.

A fossil stellar magnetic field is a magnetic field left behind by a star that has died. Scientists can use special tools to study the magnetic fields of these old stars and learn more about how they moved and behaved when they were alive. This helps scientists study and understand the history of stars and how they evolve over time.