Dr John Mason is a former President of the British Astronomical Association, and a full member of the International Astronomical Union. He has given us many lectures over the years, all of them superb! He knows ‘everything about everything’ in astronomy.
Next to a Total Solar Eclipse, a good aurora is probably the most spectacular sight in the sky. They have been recorded since antiquity, and they are only about 50 miles above out heads, yet there’s a lot we don’t know about them.