Meet NASA inventor William "Red" Whittaker! He's here to introduce readers to caves on other planets. Alongside Red, readers will learn about how he and his team develop robotic missions to explore caves on the moon and Mars. They'll learn about lava tubes, orbital scouting, underground exploration, and more. Students will learn about the process of technological design and the importance of space exploration. The Inventor Feature 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!