If you've opened a fortune cookie, you've probably read an aphorism, like this one, 'The world may be your oyster, but that doesn't mean you'll get its pearl.' In just a few words this quote tells the reader a lesson about life, that you have nearly limitless possibilities, but not all of them lead to a great reward.
The exploration of Neptune has only begun with one spacecraft, Voyager 2 in 1989. Currently there are no approved future missions to visit the Neptunian system. NASA, ESA and also independent academic groups have proposed future scientific missions to visit Neptune.
What's in store for New Horizons is a five-month-long flyby reconnaissance of Pluto-Charon in summer 2015. In extended mission mode, the spacecraft then heads farther into the Kuiper Belt to scrutinize one or two of the ancient, icy mini-worlds that dwell far beyond Neptune's orbit.