14. Neptune
Neptune, the eighth planet in our solar system, follows an extraordinary orbital path, requiring a staggering 165 years to complete a single orbit around the Sun. This remarkable journey began when Neptune was first discovered in 1846, and it has taken until relatively recently, in 2011, for Neptune to conclude its inaugural post-discovery orbit.
Intriguingly, Pluto, the celestial object that was once considered the ninth planet but was later reclassified as a dwarf planet, has not come close to completing a full orbit since its initial discovery in 1930. With its significantly extended 248-year orbit, Pluto continues to trace its unique and elongated path through the depths of our solar system, captivating astronomers and space enthusiasts alike with its enigmatic nature.