Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Though regarded as the benevolent force that makes all life on Earth possible, Sun, the star at the center of our solar system, has its dark side too. Approximately every 11 years our Sun enters a period of greater activity known as the solar maximum, during which increased magnetic activity can cause potentially dangerous solar flares and coronal mass ejections and geomagnetic storms. Learn more about the causes and effects of these events, as well as their impacts on Earth in this book.