Description Is there life elsewhere in the Solar System? How many civilizations could exist in the galaxy? Will we ever meet them? Since we were little, we've been fascinated by the stars and planets. We immediately wonder if there could be creatures like you and me living on its surfaces, wondering themselves if in other places in the galaxy there are beings like them... The avalanche of questions is unstoppable: human beings are curious by nature. If you've ever asked yourself any of these questions, this book is for you.