Explore the driving force behind the Sun's variability: magnetism. Find out how the Sun's mixed-up magnetic field develops and what effect this has on solar activity.

Play the Sun Lab: http://www.pbs.org/wgbh/nova/labs/lab/sun/

Find discussion questions for this video and other resources in the Sun Lab collection on PBS LearningMedia: http://www.pbslearningmedia.org/resource/nvsl.sci.space.dynamic/the-dynamic-sun/