Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Robotic spacecrafts are spacecrafts with no humans on board, usually under telerobotic control, designed to make scientific research and measurements. Many space missions are more suited to telerobotic rather than crewed operation, due to lower cost and lower risk factors. In addition, some planetary destinations such as Venus or the vicinity of Jupiter are too hostile for human survival, given current technology. Learn more about the ambitious missions taken on by robotic spacecraft throughout the history of space exploration, their goals and amazing achievements in this book.