A child writes to a potential Alien visitor on Earth. “If you came to Earth, would you like to know that....” and the pupil provides a vast number of significant information to let him (the visitor) know us. The awarded book of Sophie Blackall was the inspiration for the creation of this program. The challenge is to create a book-guide about Earth, take into account whatever children consider important for our planet, for its residence and whatever stands on Earth in order to a possible visit shapes a view about the planet through the view of the children. Following this process we pursue to develop capabilities, skills, values, stances and knowledge to the pupils so that they realize the meaning of the active citizens, who care about the planet, humans and the animals live on it.