A giant ball of gas and raw energy with a temperature of up to 15 million degrees, the sun is the origin of life on earth and influences an infinite number of natural phenomena. This documentary is dedicated to the search for the significance of our home star for mankind, science and nature. Researchers at the American Space Agency NASA, the Canary Islands observatories, and the hottest and coldest places on earth share their insights. We can expect an emotional journey through science and history, peppered with human stories, at the end of which the complex bandwidth of life is revealed. Never before in the history of mankind has it been more important to uncover the secrets of the sun. Because for our earth, the sun is not just any star. It is the ultimate star.