Discover the science behind the incredible space missions that have furthered our knowledge of the universe. Extraordinary images highlight facts about what we have learned about other planets, whether there might be other forms of life out there, and where we intend to explore next. Each title in this series contains a mission activity that poses a challenge for readers to solve. Understanding Our Sun, Life on Earth could not exist without the Sun. Read about what the Sun is made of its life phases, and how we might harness its power for our use now and for the future. Book jacket.