The unmanned Voyager 1 and 2 probes were launched in 1977 on a mission to visit all the outer planets of the solar system. After 35 years in space, the twin probes are approaching the edge of our solar system.
Crescent Moon & Earth from space. "Quite possibly, the purpose of the universe is to provide a congenial home for self-conscious creatures who can ask profound questions and who can probe the nature of the universe itself.
If Our Universe Is So Old and Vast, Then Where Are All the Aliens?