If you look at flight maps you can see small stipulated lines with magnetic field direction - on the map. I was told that these lines were moving over time, so as a pilot I had to buy new maps once in a while. The magnetic lines are not static they are moving. This means that the magnetic north is moving too and in fact there has been a movement of the magnetic North of more than 40 km/year, moving north from Alaska to Siberia. In this podcast science journalist Jens Degett is asking Professor Chris Finlay questions on how the magnetic field is created on our earth. Why it may shift or reverse and what importance magnetic fields are protecting our planet from having our atmosphere blown away by the solar wind ogf particles. There is a lot of interesting stories on how we can use manometers in mobile phones to measure direction and finally Chris Finlay reveal how different the magnetic fields are on other planets. in our solar system and beyond.