The magnetic field of the sun is the area outside of the corona in space,
and it is so large that it stretches beyond earth all the way beyond pluto in our solar system.
The magnetic field is like a big cloud with winds that have an effect on all of our planets, and can even cause changes in the weather on earth.
The field swirls around in a circle, and can't be seen but scientists have tried to draw what it might look like.
(from: wikipedia - sun)
Kid Facts - Blast from the past: Betelgeuse
