Neptune, one of the farthest planets from the sun, has the longest orbit, with one year lasting 165 Earth years.

Pfalzner notes that several objects beyond the orbit of Neptune move on eccentric orbits. “Several thousand celestial bodies are known to move beyond the orbit of Neptune,” said Pfalzner.

Scientists using a telescope in Hawaii have discovered a never-before-seen dwarf planet lurking within the ring of icy bodies beyond the orbit of Neptune. The small new world -- temporarily named ...