Meet NASA inventor Stephanie Thomas! She's here to introduce readers to the fusionpowered spacecraft, a hyperpowered space ship that relies on fission rather than rocket fuel or electricity. Alongside Stephanie, readers will learn about how she and her team are designing the spacecraft by utilizing the power of radioactive materials and fission. They'll learn about energy sources, fusion power, electricity and more. Students will learn about the process of technological design and the importance of space exploration. The Inventor Challenge at the back of the book encourages readers to create their own inventions. For more information about interesting space inventions, check out other titles in the Out of This World series!.