It’s a very spectacular phenomenon which occurs regularly, at night, in the northern hemisphere.

You can see huge colored waves of light, which move quickly and seem to dance in the sky. Wow!

The same thing happens in the southern hemisphere. It is called aurora australis.

But what causes them?

Polar auroras are born from the meeting between particles ejected by the Sun and the Earth’s atmosphere.

Yes, the Sun is constantly ejecting particles in all directions; we call this the solar wind.