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Trans-Neptunian object

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Eris and its moon Dysnomia are both Trans-Neptunian Objects

Trans-Neptunian object or TNO is a name astronomers give to any minor planet in the Solar System which orbits (goes around) the Sun beyond the planet Neptune. There are over a thousand of them.^[1] Many are in the Kuiper belt.

References

↑ Minor Planet Center. [1]

Planets	Terrestrials Mercury Venus Earth Mars Giants Jupiter Saturn Uranus Neptune Dwarfs Ceres Pluto Haumea Makemake Eris

Moons	Earth Moon other near-Earth objects Mars Phobos Deimos Jupiter Ganymede Callisto Io Europa all 79 Saturn Titan Rhea Iapetus Dione Tethys Enceladus Mimas Hyperion Phoebe all 82 Uranus Titania Oberon Umbriel Ariel Miranda all 27 Neptune Triton Proteus Nereid all 14 Pluto Charon Nix Hydra Kerberos Styx Eris Dysnomia Haumean Hiʻiaka Namaka Makemake S/2015 (136472) 1

Lists	Comets Possible Dwarf planets Gravitationally rounded objects Minor planets Natural satellites Solar System models Solar System objects by size by discovery date Interstellar/Circumstellar molecules

Small Solar System bodies	Comets Damocloids Meteoroids Minor planets Names and meanings moons Planetesimal Mercury-crossers Venus-crossers Venus trojans Near-Earth objects Earth-crossers Earth trojans Mars-crossers Mars trojans Asteroid belt Asteroids Ceres Pallas Juno Vesta active first 1000 families exceptional Kirkwood gap Jupiter-crossers Jupiter trojans Centaurs Saturn-crossers Uranus-crossers Uranus trojans Neptune-crossers Cis-Neptunian objects Centaurs Neptune trojans Trans-Neptunian objects Kuiper belt Cubewanos Plutinos Detached objects Sednoids Scattered disc Oort cloud Hills cloud

Rings	Jovian Saturnian (Rhean) Charikloan Chironean Uranian Neptunian Haumean

Hypothetical objects	Fifth giant Nemesis Phaeton Planet Nine Planet V Planet X Subsatellites Theia Tyche Vulcan Vulcanoids

Exploration (outline)	Colonization Discovery astronomy historical models timeline Human spaceflight space stations list Space probes timeline list Mercury Venus Moon mining Mars Ceres Asteroids mining Comets Jupiter Saturn Uranus Neptune Pluto Deep space

Formation and evolution	Accretion Accretion disk Excretion disk Circumplanetary disk Circumstellar disc Circumstellar envelope Coatlicue Cosmic dust Debris disk Detached Objects Disrupted planet EXCEDE Exozodiacal dust Extraterrestrial materials Sample-return mission Sample curation Giant-impact hypothesis Gravitational collapse Hills Cloud Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar medium Interstellar space Kuiper belt Merging stars Molecular cloud Nebular hypothesis Oort cloud Outer space Planetary migration Planetary system Planetesimal Planet formation Protoplanetary disk Ring system Rubble pile Scattered disc Star formation

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