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.
An artist's impression of NASA's New Horizons spacecraft in the Kuiper Belt beyond Pluto. Credit Alex Parker, via NASA. The next destination for NASAâs Pluto probe is to be a much smaller ice ball in the outer solar system, the space agency announced on Friday.