Crescent Earth and Moon, 1977.

This picture was taken by the Voyager 1 spacecraft on 18th September 1977 when 12 million kilometres from Earth on its way to fly past Jupiter. The Moon is faintly visible in the bottom left corner of the image. NASA's two Voyager spacecraft were launched in 1977 to explore the planets of the outer Solar System and both were succesful, returning many high quality pictures as well as scientific data.