Crescent Neptune and Triton.

Gliding through the outer Solar System , in 1989 the Voyager 2 spacecraft looked toward the Sun to find this view of most distant planet Neptune and its moon Triton together in a crescent phase. The elegant image of ice-giant planet and largest moon was taken from behind just after Voyager's closest approach . It could not have been taken from Earth because the most distant planet never shows a crescent phase to sunward eyes . Heading for the heliopause and beyond , the spacecraft's parting vantage point also robs Neptune of its familiar blue hue .