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.
Their discovery was made in the first Alien movie, when the commercial starship Nostromo set down on the unsurveyed moon LV-426 in response to a signal interpreted as a distress call. The crew found a wrecked derelict spacecraft with a dead lifeform inside, apparently its pilot.