In August and September 1977, Voyagers 1 and 2 were launched to embark on the most extensive tour ever undertaken by a spacecraft. The Voyager spacecraft visited a number of previously unexplored planets and provided unique insight into these unknown worlds. In 1989, the Voyager spacecraft started an even bigger adventure into a new frontier that is, according to specialists in this field, very close to completion. Voyager is supposed to leave the space that is carved out by the supersonic solar wind of the Sun and begin exploring the region where the heliosphere interfaces with the interstellar medium. When this occurs, the Voyager spacecraft will be part of the history of humankind once again. They will be the first spacecraft to leave the region of space dominated by the Sun!