Crescent Neptune and Triton . ... Credit Copyright: Voyager 2, NASA Explanation: Gliding silently through the outer Solar System , the Voyager 2 spacecraft camera captured Neptune and Triton together in crescent phase in 1989. ... It could not have been taken from Earth because Neptune never shows a crescent phase to sunward Earth. The unusual vantage point also robs Neptune of its familiar blue hue , as sunlight seen from here is scattered forward, and so is reddened like the setting Sun . ...