William D Adams 
Clockwork Venus Rover [PDF ebook] 

Meet NASA inventor Jonathan Sauder! He’s here to introduce readers to the clockwork Venus rover, a special spacecraft designed to explore the extreme surface of Venus. Alongside Jonathan, readers will learn about how he and his team designed the rover using clockwork and automaton technology. Students will be introduced to 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!