trans-Neptunian
Past eighth planet
Trans-Neptunian describes celestial objects orbiting the sun beyond Neptune, the outermost major planet.
The trans-Neptunian region includes Pluto, other dwarf planets, and countless smaller bodies in the Kuiper Belt and beyond.
The discovery of trans-Neptunian objects led to Pluto's reclassification as a dwarf planet.
Outer solar system region
- PlutoKuiper Belt dwarf world
- ErisGreek personification of conflict
- SednaDistant minor planet
- CharonMythical underworld ferryman
dwarf · planetesimal · resonance · eccentricity · inclination · perihelion · aphelion · scattered
Regions beyond nearby planets
- outermostFarthest from the middle
- remoteDistant or controller
- far-flungScattered over vast areas
- edgeBoundary or sharpness
boundary · frontier · beyond · extreme · fringe · outlying · peripheral · inaccessible
Not yet discovered
- undiscoveredNot yet found
- faintWeak and indistinct
- dimLow in light
- elusiveHard to find
uncharted · unexplored · hypothetical · dark · hidden · unseen · primordial · ancient
Kuiper
Outer solar system region
Charon · dwarf · planetesimal · resonance · eccentricity · inclination · perihelion · aphelion · scattered · classical
deep-space
Regions beyond nearby planets
edge · boundary · frontier · beyond · extreme · fringe · outlying · peripheral · inaccessible · far-off
unknown
Not yet discovered
- undiscoveredNot yet found
- faintWeak and indistinct
- dimLow in light
elusive · uncharted · unexplored · hypothetical · dark · hidden · unseen · primordial · ancient · relic
trans-Neptunianinner planet
Rocky world near sun
Mercury · Venus · terrestrial planet · Mars · Earth
trans, Neptune, transit, transitory, transition, transient, transport, transfer, transmit