 The Galileo Mobile project is a two-month expedition to bring the wonder and excitement of astronomy to young people from Chile, Bolivia and Peru. Supported by ESO and other partners, astronomers and educators will travel through a region of the Andes Mountains aboard the Galileo Mobile, offering astronomical activities such as workshops for students and star parties for the general public. Galileo Mobile is an educational project that leads the international year of astronomy to countries from South America. 2009 is the International Year of Astronomy, which is a global celebration commemorating the first use of a telescope to view the Universe by the Italian astronomer Galileo Galilei 400 years ago. The Galileo Mobile is designated as a special project within this framework. Spearheading the Galileo Mobile is a group of enthusiastic Latin American and European PhD students, journalists and social researchers from the European Southern Observatory, the Max Planck Society, the University Observatory Munich and the Stockholm University Observatory. This itinerant educational program is intended to reach about 15,000 people during eight weeks in October and November 2009 and will cover 5,000 kilometers. The voyage will largely take place across the high plateau of the Altiplano lying 3,600 meters above sea level and shared by Peru, Bolivia and Chile. The Galileo Mobile project will promote a basic scientific education through astronomy by visiting schools and communities. Well, we are going to travel on board the Galileo Mobile, which is a truck equipped with telescopes and medical equipment. The team will offer unique sky-observing opportunities and star parties to young students as well as other locals. We want to teach basic astronomy and physics concepts through educational activities and experiments and also observations with telescopes during the day and during the night. By stimulating curiosity, critical thinking and a sense of wonder and discovery for the universe and our planet, the Galileo Mobile project hopes to encourage interest in astronomy and science and exchange culturally different visions of the cosmos. South America and the Andes Mountains were also chosen for the Galileo Mobile project because of the region's high elevation and dry climate, which guarantees superb sky quality for astronomical observations. The journey starts on 5th October 2009 in Antofagasta, Chile, heads north through La Paz in Bolivia and on into Peru. The Galileo Mobile then returns to Antofagasta via the Panamericana Coastal Road. To chronicle this remarkable voyage, members of the Galileo Mobile team will write entries for the Galileo Mobile blog and for the Cosmic Diary, an online blog come journal that is also a cornerstone project of the International Year of Astronomy 2009, as well as running a Twitter feed, Flickr and a Facebook page. The team will be accompanied by a film crew who will produce a multilingual documentary of the expedition that will be distributed in schools around the world. Galileo Mobile is a traveling educational project with both a scientific and a cultural aspect that will bring the Year of Astronomy to many schools across Chile, Bolivia and Peru. We will exchange different visions of the cosmos and create a feeling of unity under the same sky. We wish the team every success in sharing the wonders of the universe with communities in South America where the skies are crystal clear.