user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: who was neptune discovered by? 
Knowledge Triplets: Halimede, astronomy.star_system_body.star_system, Solar System
m.09xf_t3, common.webpage.in_index, Entertainment Weekly annotation index
Venus, book.book.genre, Children's literature
Galatea, common.topic.notable_for, g.1256np3py
Naiad, astronomy.orbital_relationship.orbits, Neptune
Mathematical prediction, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, Pluto
Triton, common.topic.notable_for, g.1255l1m9t
Sun, book.book_subject.works, Mademoiselle Moon
Mathematical prediction, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, Neptune
Neptune, astronomy.orbital_relationship.orbit_type, Heliocentric orbit
Neptune, base.schemastaging.context_name.pronunciation, g.125_pcdtb
Neptunium, chemistry.chemical_element.chemical_series, Metal
Great Dark Spot, common.topic.image, Neptune darkspot
Neptunium, chemistry.chemical_element.isotopes, Neptunium-233
Planet, common.topic.notable_for, g.125dd39s3
m.09x084c, common.webpage.in_index, Entertainment Weekly annotation index
Solar System, astronomy.star_system.dwarf_planets, Pluto
Neptune, film.film_character.portrayed_in_films, m.0h7j2z0
m.09xss5b, common.webpage.topic, Sun
Neptune (Planet), base.skosbase.skos_concept.in_scheme, Authorities Concept Scheme
m.09w2r8n, common.webpage.in_index, Entertainment Weekly annotation index
Venus, astronomy.celestial_object.category, Planet
Halimede, astronomy.orbital_relationship.orbits, Neptune
Sun, astronomy.celestial_object.category, Star
m.0b48_jz, common.webpage.topic, Sun
Neptunium, chemistry.chemical_element.isotopes, Neptunium-238
Sun, common.topic.webpage, m.0b46w0c
Neptunium, chemistry.chemical_element.isotopes, Neptunium-239
Astronomer, freebase.equivalent_topic.equivalent_type, Astronomer
Astronomer, freebase.type_profile.equivalent_topic, Astronomer
Solar System, book.book_subject.works, The moon book
Neptunium, symbols.namesake.named_after, Neptune
Earth, book.book_subject.works, Planet Earth, inside out
Venus, book.written_work.subjects, Science
m.09y48fw, common.webpage.in_index, Entertainment Weekly annotation index
Neptune, astronomy.astronomical_discovery.discoverer, John Couch Adams
m.09xylc8, common.webpage.in_index, Entertainment Weekly annotation index
Neptune, common.topic.notable_types, Book
Johann Gottfried Galle, people.person.nationality, Germany
Neptune, astronomy.astronomical_discovery.discoverer, Heinrich Louis d'Arrest
Nereid, astronomy.astronomical_discovery.discoverer, Gerard P. Kuiper
Solar System, book.book_subject.works, Uranus
Neptune, common.topic.image, Poseidón, dios del mar
Solar System, book.book_subject.works, Destination, Jupiter
Sun, common.topic.article, m.06m__
Solar System, book.book_subject.works, The planets
Heinrich Louis d'Arrest, people.person.ethnicity, Germans
Solar System, astronomy.star_system.planets, Neptune
m.09xhgd6, common.webpage.in_index, Entertainment Weekly annotation index
Heinrich Louis d'Arrest, common.topic.image, Heinrich Louis d'Arrest
Johann Gottfried Galle, astronomy.astronomer.astronomical_objects_discovered, Neptune
m.0jvsp4h, people.marriage.spouse, Johann Gottfried Galle
Johann Gottfried Galle, people.person.spouse_s, m.0jvsp4h
Despina, common.topic.article, m.02rfhr
Galatea, common.topic.article, m.02rfkd
Neptune, base.exoplanetology.exoplanet.parent_star, Sun
Thalassa, common.topic.image, Naiad Voyager
Neptune, astronomy.astronomical_discovery.discovery_technique, Direct imaging
m.09w1wmz, common.webpage.topic, Sun
m.09ypz7b, common.webpage.topic, Sun
Mercury, Venus, Neptune…Maude?, common.resource.annotations, m.09xf_s1
Venus, book.written_work.author, Seymour Simon
Planet, astronomy.celestial_object_category.objects, Neptune
Thalassa, common.topic.article, m.02rfgv
Solar System, book.book_subject.works, Venus
Larissa, astronomy.orbital_relationship.orbits, Neptune
Neptune, common.image.appears_in_topic_gallery, Transit of Mars from Neptune
Solar System, astronomy.star_system.dwarf_planets, Haumea
Neptune (Planet), base.skosbase.skos_concept.broader, Outer planets
Neptune, symbols.name_source.namesakes, Neptune
Planet, common.topic.article, m.05qd9
Neptune, symbols.name_source.namesakes, Neptunalia
Astronomer, people.profession.part_of_professional_field, Astronomy
Sidereus Nuncius, book.written_work.subjects, Solar System
Solar System, book.book_subject.works, Planet Earth, inside out
Sidereus Nuncius, book.written_work.subjects, Science
Sun, astronomy.celestial_object_with_coordinate_system.planetographic_coordinate_system, Heliographic coordinate system
Astronomer, freebase.type_profile.strict_included_types, Topic
Sun, astronomy.star.spectral_type, G2V
m.04m0gp2, education.education.student, Johann Gottfried Galle
m.09w1wmz, common.webpage.in_index, Entertainment Weekly annotation index
Neptune, common.topic.notable_for, g.1257b0_jm
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, SCR 1845 b
Neptune, common.topic.image, Neptune is usually depicted with a trident, as seen here in this statue by Jean de Boulogne in Bologna, Italy
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, 2M1207 b
Neptunium, chemistry.chemical_element.isotopes, Neptunium-243
Sidereus Nuncius, book.written_work.subjects, Astronomy
Johann Gottfried Galle, people.person.education, m.04m0gp2
Neptune, symbols.name_source.namesakes, Neptunium
Heinrich Louis d'Arrest, people.person.gender, Male
Halimede, common.topic.image, Halimede is encircled in these 2 photographs
Urbain Le Verrier, people.person.profession, Astronomer
Urbain Le Verrier, influence.influence_node.influenced_by, Joseph Louis Gay-Lussac
Neptunium, common.topic.image, Neptunium2
Neptune, common.topic.notable_types, Deity
Johann Gottfried Galle, people.person.parents, J. Gottfried Galle
Sun, astronomy.star.planet_s, Mars
Urbain Le Verrier, common.topic.image, Urbain Le Verrier
Urbain Le Verrier, education.academic.research_areas, Mathematics
Sun, common.topic.webpage, m.09xg788
Planet, astronomy.celestial_object_category.subcategories, Giant planet
Neptune, base.wastrology.astrologicalplanet.astrologicalrulership, Pisces
Solar System, astronomy.star_system.dwarf_planets, Makemake
John Couch Adams, common.topic.article, m.017xwq
Book, freebase.type_profile.published, Published
Solar System, book.book_subject.works, The Secret of the Universe
m.09x0tnd, common.webpage.topic, Sun
Sun, common.topic.notable_for, g.125b1mp6p
Johann Gottfried Galle, common.topic.image, Johann Gottfried Galle
m.07nfgzp, base.ontologies.ontology_instance_mapping.freebase_topic, Planet
Johann Gottfried Galle, people.person.parents, Marie Henriette
m.07ng7dz, base.ontologies.ontology_instance_mapping.freebase_topic, Neptune
Psamathe, astronomy.astronomical_discovery.discoverer, Scott S. Sheppard
Neptune, astronomy.celestial_object.celestial_age, m.0j5jn4d
Planet, freebase.equivalent_topic.equivalent_type, Planet
Book, freebase.type_profile.kind, Definition
Proteus, symbols.namesake.named_after, Proteus
Sun, common.topic.webpage, m.0b47268
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, GQ Lup b
Neptunium, chemistry.chemical_element.isotopes, Neptunium-236
Neptunium, common.topic.notable_for, g.1254z5mts
m.0b48sgp, common.webpage.topic, Sun
Neptune, symbols.name_source.namesakes, Neptune's Grotto
Leo, base.wastrology.zodiacsign.astrologicalrulership, Sun
m.09w2zy5, common.webpage.in_index, Entertainment Weekly annotation index
Small Dark Spot, common.topic.image, Cyclones on Neptune
Neptunium, chemistry.chemical_element.isotopes, Neptunium-229
John Couch Adams, education.academic.research_areas, Astronomy
Solar System, book.book_subject.works, Universe
Sun, base.satelites.orbited_body.natural_satellite_s, Neptune
Neptune, common.topic.webpage, m.09xf_s1
Solar System, astronomy.star_system.planets, Mercury
Neptune, visual_art.art_subject.artwork_on_the_subject, Neptune Calming the Waves
Triton, astronomy.astronomical_discovery.discoverer, William Lassell
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, HR 8799 c
Heinrich Louis d'Arrest, people.person.education, m.0jw9wrr
Solar System, astronomy.star_system.planets, Earth
Venus, book.written_work.subjects, Astronomy
Sun, astronomy.star.planet_s, Neptune
m.0h7j2z0, film.performance.character, Neptune
Heinrich Louis d'Arrest, common.topic.notable_types, Astronomer
Neptune, visual_art.art_subject.artwork_on_the_subject, Neptune and Triton
Solar System, book.book_subject.works, Exploring the Earth and the Cosmos
m.09xf_s1, common.webpage.topic, Neptune
Neptune, astronomy.celestial_object.category, Planet
Neptune, common.topic.image, Pl-gdansk-neptun2004
Neptune, book.book.genre, Children's literature
Neptune, astronomy.astronomical_discovery.discoverer, Johann Gottfried Galle
Johann Gottfried Galle, education.academic.research_areas, Astronomy
Neptune, astronomy.astronomical_discovery.discoverer, Johann Gottfried Galle
John Couch Adams, common.topic.notable_types, Astronomer
Sun, astronomy.star.planet_s, Jupiter
Heinrich Louis d'Arrest, people.person.profession, Astronomer
m.09w2zy5, common.webpage.topic, Sun
m.0b48mm_, common.webpage.topic, Sun
Neptune, book.written_work.subjects, Science
Naiad, common.topic.article, m.05hxs
Sidereus Nuncius, book.book.genre, Science
m.09ybmyq, common.webpage.in_index, Entertainment Weekly annotation index
Solar System, book.book_subject.works, Planet Mars
m.09x0tnd, common.webpage.in_index, Entertainment Weekly annotation index
Astronomer, freebase.type_hints.included_types, Topic
Proteus, astronomy.star_system_body.star_system, Solar System
Urbain Le Verrier, common.image.appears_in_topic_gallery, Urbain Le Verrier
Neptune, base.satelites.natural_satellite.orbited_body, Sun
John Hymers, people.person.profession, Mathematician
Neptunium, chemistry.chemical_element.periodic_table_block, f-block
Neptunium, common.topic.image, Np-TableImage
Naiad, common.topic.notable_for, g.1257q_wyn
John Couch Adams, people.person.profession, Astronomer
Johann Gottfried Galle, common.topic.notable_types, Astronomer
France, location.country.capital, Paris
Neptunium, chemistry.chemical_element.isotopes, Neptunium-232
Solar System, book.book_subject.works, The Orrery
Neptune, common.topic.image, Neptune
Solar System, book.book_subject.works, Stargazers and Gravediggers
Solar System, book.book_subject.works, The Relativity of Wrong
m.09x084c, common.webpage.topic, Sun
Book, freebase.type_hints.included_types, Topic
Heliocentric orbit, astronomy.orbit_type.orbiting_bodies, Uranus
Solar System, book.book_subject.works, Moon Hunters
Solar System, book.book_subject.works, The Mars mystery
Galatea, common.topic.image, Galatea
Planet, common.topic.image, Planetart
Proteus, common.topic.article, m.016wd3
John Couch Adams, astronomy.astronomer.astronomical_objects_discovered, Neptune
Neptune, symbols.name_source.namesakes, Fountain of Neptune, Bologna
Thalassa, astronomy.orbital_relationship.orbits, Neptune
m.09ypz7b, common.webpage.in_index, Entertainment Weekly annotation index
m.09xss5b, common.webpage.in_index, Entertainment Weekly annotation index
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, AB Pic b
Neptune, book.written_work.subjects, Neptune
Heinrich Louis d'Arrest, astronomy.astronomer.astronomical_objects_discovered, Neptune
Astronomy, freebase.equivalent_topic.equivalent_domain, Astronomy
Sun, common.topic.webpage, m.0b48sgp
Solar System, astronomy.star_system.planets, Jupiter
Neptune, symbols.name_source.namesakes, Fountain of Neptune, Florence
On the revolutions, book.written_work.subjects, Astronomy
Nereid, common.topic.image, Nereid-Voyager2
Astronomer, people.profession.corresponding_type, Astronomer
Neptune, common.topic.article, m.0c31t
Neptune, astronomy.star_system_body.star_system, Solar System
Earth, book.book_subject.works, Exploring the Earth and the Cosmos
Neptune, astronomy.orbital_relationship.orbited_by, Sao
Neptune, astronomy.orbital_relationship.orbited_by, Despina
Laomedeia, common.topic.article, m.03939n
John Hymers, education.academic.advisees, John Couch Adams
Neptune, common.image.appears_in_topic_gallery, Neptune
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, Arietids
Sao, common.topic.article, m.039385
Solar System, book.book_subject.works, Mercury
Neptune, astronomy.orbital_relationship.orbited_by, Triton
Neptune, astronomy.orbital_relationship.orbited_by, Thalassa
Johann Gottfried Galle, people.person.places_lived, m.0jvsn_f
Heinrich Louis d'Arrest, education.academic.research_areas, Astronomy
Planet, freebase.type_hints.included_types, Topic
m.09xf_t3, common.webpage.resource, Mercury, Venus, Neptune…Maude?
Proteus, astronomy.celestial_object.category, Natural satellite
Laomedeia, common.topic.notable_for, g.1259dwqpb
Neptunium, common.topic.notable_types, Chemical Element
Galatea, astronomy.orbital_relationship.orbits, Neptune
Solar System, astronomy.star_system.dwarf_planets, Ceres
Planet, type.type.domain, Astronomy
Halimede, astronomy.celestial_object.category, Natural satellite
Urbain Le Verrier, people.person.profession, Mathematician
Neptunium, chemistry.chemical_element.isotopes, Neptunium-237
Nereid, common.topic.notable_for, g.1255jhqsq
Astronomer, freebase.type_profile.published, Published
Neptune, astronomy.celestial_object.locations, Great Dark Spot
Neptune, common.image.appears_in_topic_gallery, Discovery of Neptune
Despina, common.topic.notable_for, g.125b667j4
Heinrich Louis d'Arrest, astronomy.astronomer.astronomical_objects_discovered, 6P/d'Arrest
Heinrich Louis d'Arrest, common.topic.notable_for, g.1259zl2c5
Sun, common.topic.webpage, m.0b47285
Solar System, book.book_subject.works, The Space Atlas
Naiad, common.topic.image, Naiad Voyager
Earth, common.topic.notable_types, Planet
Neptune, astronomy.orbital_relationship.orbits, Sun
m.03pf1l7, people.place_lived.person, Heinrich Louis d'Arrest
Planet, common.topic.article, m.03ywtv2
Neptune, astronomy.orbital_relationship.orbited_by, Naiad
Laomedeia, astronomy.celestial_object.category, Natural satellite
Sun, common.topic.image, Sun920607
Neptunium, chemistry.chemical_element.isotopes, Neptunium-240
Neptune, common.topic.image, Urbain Le Verrier
Astronomy, people.professional_field.professions_in_this_field, Astronomer
Urbain Le Verrier, common.image.appears_in_topic_gallery, Neptune
Potsdam, location.location.containedby, Germany
Neptunium, chemistry.chemical_element.chemical_series, Toxic heavy metal
John Couch Adams, education.academic.advisors, John Hymers
m.09xylc8, common.webpage.topic, Sun
Johann Gottfried Galle, people.person.ethnicity, Germans
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, HR 8799 d
Neptune, book.written_work.author, Seymour Simon
Naiad, astronomy.celestial_object.category, Natural satellite
m.09xf_s1, common.webpage.in_index, Entertainment Weekly annotation index
Urbain Le Verrier, astronomy.astronomer.astronomical_objects_discovered, Neptune
Neptune, astronomy.astronomical_discovery.discoverer, John Couch Adams
Neptunium, chemistry.chemical_element.isotopes, Neptunium-230
Proteus, common.topic.image, Proteus
Sun, astronomy.star.planet_s, Mercury
Sun, astronomy.star.star_system, Solar System
Neptune (Planet), base.skosbase.skos_concept.narrower, Neptune (Planet)--Ring system
Planet, type.type.expected_by, Planet
Sun, base.wastrology.astrologicalplanet.astrologicalrulership, Leo
m.09y0_fn, common.webpage.topic, Sun
Neptunium, chemistry.chemical_element.isotopes, Neptunium-234
Venus, book.written_work.subjects, Venus
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, CT Cha b
Neptune, common.topic.notable_for, g.125bnl7lm
Venus, book.book_subject.works, Venus
De revolutionibus orbium coelestium, common.topic.notable_types, Book
Neptune, symbols.namesake.named_after, Neptune
Sao, astronomy.orbital_relationship.orbits, Neptune
m.0jw9wrr, education.education.student, Heinrich Louis d'Arrest
Heinrich Louis d'Arrest, people.person.nationality, Germany
m.07nfsjj, base.ontologies.ontology_instance_mapping.freebase_topic, Sun
Neptunium, chemistry.chemical_element.atomic_mass, m.05_fcxz
Neptune, common.topic.notable_types, Planet
Neptune, base.grecoromanmythology.roman_deity.greek_equivalent, Poseidon
Sun, astronomy.star.planet_s, Uranus
Solar System, book.book_subject.works, Patrick Moore on Mars.
Neptune, common.image.appears_in_topic_gallery, Exploration of Neptune
Planet, astronomy.celestial_object_category.objects, Uranus
Despina, common.topic.image, Despina
Psamathe, common.topic.image, Zdjęcie Tetydy wykonane przez sondę Cassini
Neptune, astronomy.orbital_relationship.orbited_by, Nereid
Neso, common.topic.article, m.0393bf
Planet, type.type.expected_by, Planets
Neptune, astronomy.orbital_relationship.orbited_by, Psamathe
Planet, astronomy.celestial_object_category.subcategories, Ice planet
Halimede, common.topic.image, Halimede
m.09wcr2g, common.webpage.in_index, Entertainment Weekly annotation index
Urbain Le Verrier, common.topic.notable_for, g.1258t5r6_
Small Dark Spot, astronomy.extraterrestrial_location.on_celestial_object, Neptune
Astronomy, education.field_of_study.academics_in_this_field, Johann Gottfried Galle
Solar System, book.book_subject.works, Sidereus Nuncius
Neptune, astronomy.celestial_object.locations, Small Dark Spot
Neptune, astronomy.orbital_relationship.orbited_by, Larissa
Solar System, book.book_subject.works, Neptune
m.09xf_s1, common.webpage.resource, Mercury, Venus, Neptune…Maude?
Neptune (Planet), base.skosbase.skos_concept.in_scheme, Geographic Names Concept Scheme
Solar System, astronomy.star_system.planets, Saturn
Sun, common.topic.webpage, m.09yx3gz
Neso, common.topic.notable_for, g.1256339w6
Solar System, book.book_subject.works, Saturn
John Couch Adams, people.person.education, m.03l6v4j
Planet, freebase.type_profile.published, Published
Neptune, common.topic.article, m.025rvxh
Germany, location.country.capital, Berlin
Sun, astronomy.star.planet_s, Saturn
Solar System, book.book_subject.works, De revolutionibus orbium coelestium
Psamathe, common.topic.article, m.0393bx
Solar System, book.book_subject.works, Mars
m.09wjfwj, common.webpage.topic, Sun
Neptune, astronomy.astronomical_discovery.discoverer, Urbain Le Verrier
Solar System, book.book_subject.works, The Case for Mars
Deity, freebase.type_profile.published, Published
m.0b46w0c, common.webpage.topic, Sun
Neptunium, chemistry.chemical_element.isotopes, Neptunium-226
Earth, astronomy.orbital_relationship.orbits, Sun
m.0b47285, common.webpage.topic, Sun
Johann Gottfried Galle, people.person.place_of_birth, Radis
Neptune, astronomy.orbital_relationship.orbited_by, Halimede
m.09xg788, common.webpage.in_index, Entertainment Weekly annotation index
Johann Gottfried Galle, common.topic.article, m.01d9_x
Sun, common.topic.webpage, m.09w2zy5
Berlin, location.location.containedby, Germany
John Couch Adams, people.person.profession, Mathematician
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, HR 8799 b
Neptune, book.written_work.subjects, Astronomy
Nereid, astronomy.celestial_object.category, Natural satellite
m.09y48fw, common.webpage.topic, Sun
Urbain Le Verrier, common.topic.article, m.017xw7
Neptune, astronomy.astronomical_discovery.discoverer, Heinrich Louis d'Arrest
Sun, astronomy.star.planet_s, Earth
m.0jvsn_f, people.place_lived.person, Johann Gottfried Galle
Neptune, astronomy.orbital_relationship.orbited_by, Neso
Neptune, astronomy.orbital_relationship.orbited_by, Laomedeia
Great Dark Spot, astronomy.extraterrestrial_location.on_celestial_object, Neptune
Neso, astronomy.orbital_relationship.orbits, Neptune
Neptunium, chemistry.chemical_element.chemical_series, Actinide
Solar System, astronomy.star_system.planets, Uranus
Planet, astronomy.celestial_object_category.objects, Earth
Venus, book.written_work.subjects, Technology
m.0jvsn_8, people.place_lived.person, Johann Gottfried Galle
Urbain Le Verrier, common.image.size, m.02c29y3
Mercury, Venus, Neptune…Maude?, common.resource.annotations, m.09xf_t3
Neptunium, chemistry.chemical_element.isotopes, Neptunium-235
m.09w2r8n, common.webpage.topic, Sun
Laomedeia, astronomy.orbital_relationship.orbits, Neptune
m.09yx3gz, common.webpage.topic, Sun
Great Dark Spot, common.topic.image, Neptune's Great Dark Spot
Neptune, common.topic.image, Urbain Le Verrier
m.09wcr2g, common.webpage.topic, Sun
Pisces, common.topic.article, m.07b6d5
Johann Gottfried Galle, people.person.gender, Male
m.09ybmyq, common.webpage.topic, Sun
Neptunium, chemistry.chemical_element.isotopes, Neptunium-228
Astronomer, type.type.domain, Astronomy
m.09y61q7, common.webpage.in_index, Entertainment Weekly annotation index
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, Neptune
Johann Gottfried Galle, symbols.name_source.namesakes, 2097 Galle
Despina, astronomy.orbital_relationship.orbits, Neptune
Psamathe, astronomy.orbital_relationship.orbits, Neptune
Neptunium, chemistry.chemical_element.chemical_series, Period 7 element
Neptune, astronomy.astronomical_discovery.discovery_technique, Mathematical prediction
Venus, book.written_work.subjects, Solar System
Earth, astronomy.celestial_object.category, Planet
Solar System, book.book_subject.works, Exploring Mars
m.09xhgd6, common.webpage.topic, Sun
John Couch Adams, common.topic.notable_for, g.125b9klh8
Heliocentric orbit, astronomy.orbit_type.orbiting_bodies, Neptune
Sao, common.topic.notable_for, g.125fpl36v
Heinrich Louis d'Arrest, astronomy.astronomer.astronomical_objects_discovered, 76 Freia
Solar System, astronomy.star_system.plutoids, Eris
Johann Gottfried Galle, common.topic.image, JohannGalle
Solar System, astronomy.star_system.dwarf_planets, Eris
Neptune (Planet), base.skosbase.skos_concept.equivalent_topic, Neptune
Halimede, common.topic.notable_for, g.1255c50d6
Neptune, common.image.size, m.02bmbyr
Solar System, book.book_subject.works, Worlds in Collision
m.09wjd30, common.webpage.topic, Sun
m.09y61q7, common.webpage.topic, Sun
Urbain Le Verrier, common.topic.notable_types, Astronomer
m.0b47268, common.webpage.topic, Sun
John Couch Adams, book.author.works_written, On Newton's solution of Kepler's problem
m.09y6xcs, common.webpage.in_index, Entertainment Weekly annotation index
Poseidon, common.topic.notable_types, Deity
De revolutionibus orbium coelestium, book.written_work.subjects, Astronomy
Neptunium, chemistry.chemical_element.isotopes, Neptunium-231
Planet, freebase.type_profile.equivalent_topic, Planet
Neptune, base.ontologies.ontology_instance.equivalent_instances, m.07ng7dz
Nereid, common.topic.article, m.05f24
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, Kerberos
Larissa, astronomy.astronomical_discovery.discoverer, David J. Tholen
De revolutionibus orbium coelestium, book.book.genre, Science
Neptunium, chemistry.chemical_element.isotopes, Neptunium-227
Sun, astronomy.star.planet_s, Venus
m.09yx3gz, common.webpage.in_index, Entertainment Weekly annotation index
Solar System, astronomy.star_system.plutoids, Pluto
m.09wjd30, common.webpage.in_index, Entertainment Weekly annotation index
De revolutionibus orbium coelestium, book.written_work.subjects, Solar System
Neptune, book.written_work.subjects, Technology
Halimede, common.topic.article, m.039368
Direct imaging, astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method, Fomalhaut b
Psamathe, common.topic.notable_for, g.1257545rt
m.09wjfwj, common.webpage.in_index, Entertainment Weekly annotation index
Neptune, visual_art.art_subject.artwork_on_the_subject, Neptune
m.0b48vmd, common.webpage.topic, Sun
Johann Gottfried Galle, people.person.profession, Astronomer
Triton, astronomy.orbital_relationship.orbits, Neptune
Neptunium, chemistry.chemical_element.isotopes, Neptunium-241
Planet, freebase.type_profile.kind, Definition
m.09xg788, common.webpage.topic, Sun
Urbain Le Verrier, people.person.nationality, France
Johann Gottfried Galle, people.person.children, g.12340lk8
Neptunium, chemistry.chemical_element.isotopes, Neptunium-225
Johann Gottfried Galle, common.topic.notable_for, g.125fl6m19
Nereid, astronomy.orbital_relationship.orbits, Neptune
Heinrich Louis d'Arrest, common.topic.article, m.02bw94
Neptunium, common.topic.article, m.05bhr
Neptune, astronomy.orbital_relationship.orbited_by, Galatea
Neptune, base.skosbase.vocabulary_equivalent_topic.equivalent_concept, Neptune (Planet)
Pisces, base.wastrology.zodiacsign.astrologicalrulership, Neptune
Neptune, book.book_subject.works, Neptune
Solar System, astronomy.star_system.planets, Mars
Neptune, common.topic.notable_for, g.1255pjq1f
Solar System, book.book_subject.works, The Planets
Johann Gottfried Galle, people.person.places_lived, m.0jvsn_8
Proteus, common.topic.notable_for, g.1259sb3wy
De revolutionibus orbium coelestium, book.book.genre, Mathematics
Proteus, astronomy.orbital_relationship.orbits, Neptune
Solar System, astronomy.star_system.planets, Venus
Neptunium, chemistry.chemical_element.isotopes, Neptunium-242
Neptunium, chemistry.chemical_element.isotopes, Neptunium-244
Planet, astronomy.celestial_object_category.objects, Mercury
Neptune, book.written_work.subjects, Solar System
Poseidon, base.grecoromanmythology.greek_deity.roman_equivalent, Neptune
Planet, type.type.expected_by, Ruling Planet(s)
Heliocentric orbit, common.topic.notable_for, g.125bb5f10
Sidereus Nuncius, book.book.genre, Mathematics
Neptune, astronomy.orbital_relationship.orbited_by, Proteus
m.03l6v4j, education.education.student, John Couch Adams
m.09y6xcs, common.webpage.topic, Sun
Urbain Le Verrier, people.person.ethnicity, French people
Solar System, book.book_subject.works, Martian Enigmas

Answer: Urbain Le Verrier
John Couch Adams
Johann Gottfried Galle
Heinrich Louis d'Arrest