Intro to magnetic fields - What is the structure of the Earth's magnetosphere?

The Earth has a magnetosphere, which is like a shield made of invisible forces that protect us from space winds.

Imagine you're playing with your favorite toy car on a sunny day. Suddenly, a strong wind blows and tries to push your car off the road. But your car stays put because there's something like an invisible wall around it, that’s kind of what the magnetosphere does for Earth.

Think of Earth as having a special blanket made out of invisible strings called magnetic fields. These strings stretch from deep inside Earth all the way into space, forming a bubble-like shape known as the magnetosphere.

• On one side, like when you're facing the wind, Earth's magnetic field is strong and pushes back against space winds, this is the nightside.
• On the other side, where it’s more calm, like when your back is to the wind, the magnetosphere stretches out, this is the dayside.

Sometimes, these invisible strings get tangled or pulled by powerful space winds, making the bubble wobble a little. But overall, Earth's magnetosphere keeps us safe from most of what happens in space!