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.
When Voyager 2 flew past Neptune in 1989, it tracked and imaged the Great Dark Spot -- a storm larger than the entire Earth. When the Hubble Space Telescope imaged Neptune the spot had disappeared, only to be replaced with two smaller storms, which in turn also disappeared. Wrong Way Moon Triton, Neptune's largest moon, has a weird, backward orbit that has it inching closer to Neptune each year. When the two finally collide, the moon will be shredded into beautiful rings that may rival those of Saturn.