Sun Spots mark areas where light is trapped. Powerful electromagnetic forces interrupt the convective motion that brings hot, inner materials to the sun's surface. The largest sunspots can be over 10 times the size of Earth. | science.discovery.com/tv-shows/how-the-universe-works/ Watch full episodes: bit.ly/HTUWFullEpisodes Subscribe to Science Channel: www.youtube.com/subscription_center?add_user=sciencechannel Check out SCI2 for infinitely awesome science videos. Every day. bit.ly/SCI2YT Download the TestTube app: testu.be/1ndmmMq