Aurora Borealis: Why have the Northern lights been so good this year?

Astronomer Tom Kerss visits Norway to find out why the beautiful lights have been so good this year and why we've got lots to look forward to.

The Northern Lights may look like swirls in the sky, but they're caused by the interaction of the solar wind and Earth's magnetic field and upper atmosphere.

Expert stargazer Tom Kerss has all you need to know.