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.
Percival Lowell: Search for Planet X. The story of Pluto's discovery begins with Percival Lowell, the founder of Lowell Observatory in Flagstaff, Arizona. Lowell was obsessed with the notion of a trans-Neptunian planet, which he believed could be detected from the effect it would have on Neptune's orbit.