Data model
Entities
The entity model, stable identifiers, and how to read entities from the graph and API.
Every entity has a permanent type:slug identifier and belongs to exactly one type and domain. Read them via /api/v0/entities, /api/v0/entities/{id}, the entities index export, or the human entity index.
science
7,314
entities
culture
15
entities
astrology
22
entities
Entity types
| Type | Count | Example id |
|---|---|---|
| star | 2,998 | star:sirius |
| exoplanet | 849 | exoplanet:proxima-centauri-b |
| star_cluster | 372 | star_cluster:pleiades |
| host_star | 333 | host_star:14-her |
| planetary_system | 187 | planetary_system:14-her-system |
| galaxy | 145 | galaxy:milky-way |
| nebula | 121 | nebula:orion-nebula |
| constellation | 88 | constellation:canis-major |
| organization | 80 | organization:nasa |
| space_mission | 76 | space_mission:apollo-11 |
| launch_vehicle | 55 | launch_vehicle:saturn-v |
| cosmology_concept | 49 | cosmology_concept:the-big-bang |
| astronomer | 48 | astronomer:galileo-galilei |
| timeline_event | 42 | timeline_event:launch-of-sputnik-1 |
| asteroid | 33 | asteroid:vesta |
| scientific_instrument | 33 | scientific_instrument:mastcam-z |
| surface_feature | 32 | surface_feature:olympus-mons |
| astrophysical_object_class | 32 | astrophysical_object_class:black-hole |
| satellite | 31 | satellite:international-space-station |
| scientific_calculator | 30 | scientific_calculator:escape-velocity |
| rocket_engine | 26 | rocket_engine:f-1 |
| astronomy_method | 26 | astronomy_method:parallax |
| observatory | 25 | observatory:mauna-kea-observatories |
| catalog | 25 | catalog:messier |
| spacecraft_component | 25 | spacecraft_component:solar-array |
| physics_concept | 25 | physics_concept:wave-function |
| moon | 24 | moon:the-moon |
| astronaut | 24 | astronaut:yuri-gagarin |
| telescope | 24 | telescope:keck-i |
| launch_pad | 24 | launch_pad:lc-39a |
| stellar_physics_concept | 24 | stellar_physics_concept:hertzsprung-russell-diagram |
| mission_program | 23 | mission_program:mercury |
| historical_discovery | 22 | historical_discovery:precession-of-the-equinoxes |
| comet | 21 | comet:halleys-comet |
| scientific_image | 21 | scientific_image:webb-first-deep-field |
| space_telescope | 20 | space_telescope:hubble-space-telescope |
| meteorite | 20 | meteorite:allende |
| space_engineering_concept | 20 | space_engineering_concept:electric-propulsion |
| geological_feature_type | 18 | geological_feature_type:impact-crater |
| assistant_capability | 18 | assistant_capability:scientific-search |
| platform_capability | 18 | platform_capability:public-graph-api |
| station_module | 17 | station_module:zarya |
| graph_view | 17 | graph_view:graph-statistics |
| operations_function | 16 | operations_function:mission-control |
| research_software | 16 | research_software:scientific-python-ecosystem |
| exoplanet_science_concept | 16 | exoplanet_science_concept:transmission-spectroscopy |
| launch_site | 15 | launch_site:kennedy-space-center |
| mission_milestone | 15 | mission_milestone:first-artificial-satellite |
| mission_concept | 15 | mission_concept:artemis-ii |
| transient_class | 15 | transient_class:type-ia-supernova |
| observing_technique | 15 | observing_technique:lucky-imaging |
| mythology_figure | 14 | mythology_figure:orion |
| astronomy_era | 14 | astronomy_era:ancient-astronomy |
| image_collection | 14 | image_collection:jwst-first-images |
| atlas_view | 14 | atlas_view:all-sky-star-atlas |
| observing_planner | 14 | observing_planner:tonight-planner |
| space_weather_phenomenon | 13 | space_weather_phenomenon:solar-wind |
| astronomy_software | 13 | astronomy_software:stellarium |
| astrology_sign | 12 | astrology_sign:aries |
| wavelength_band | 12 | wavelength_band:radio |
| sky_survey | 12 | sky_survey:sloan-digital-sky-survey |
| asterism | 12 | asterism:big-dipper |
| tracking_station | 12 | tracking_station:goldstone |
| instrument_class | 12 | instrument_class:optical-camera |
| space_infrastructure | 12 | space_infrastructure:propellant-depot |
| stellar_process | 12 | stellar_process:star-formation |
| space_station | 11 | space_station:mir |
| crew_vehicle | 11 | crew_vehicle:vostok-spacecraft |
| publication | 11 | publication:almagest |
| satellite_constellation | 11 | satellite_constellation:starlink |
| time_standard | 11 | time_standard:tai |
| alert_system | 11 | alert_system:gcn |
| space_policy_topic | 11 | space_policy_topic:orbital-debris |
| orbital_mechanics_concept | 11 | orbital_mechanics_concept:restricted-three-body-problem |
| galactic_structure | 11 | galactic_structure:galactic-thin-disk |
| astrology_planet | 10 | astrology_planet:sun |
| spacecraft | 10 | spacecraft:curiosity |
| expedition | 10 | expedition:iss-expedition-1 |
| rocket_family | 10 | rocket_family:saturn |
| rocket_stage | 10 | rocket_stage:s-ic |
| spacecraft_subsystem | 10 | spacecraft_subsystem:structure |
| countermeasure | 10 | countermeasure:resistive-exercise |
| data_archive | 10 | data_archive:mast |
| planetary_process | 10 | planetary_process:planetary-differentiation |
| image_source | 9 | image_source:nasa-image-library |
| life_support_technology | 9 | life_support_technology:oxygen-generation |
| reference_frame | 9 | reference_frame:icrs |
| galactic_dynamics | 9 | galactic_dynamics:galactic-rotation |
| solar_feature | 9 | solar_feature:granulation |
| planet | 8 | planet:mars |
| exoplanet_detection_method | 8 | exoplanet_detection_method:transit |
| planetary_class | 8 | planetary_class:terrestrial |
| constellation_family | 8 | constellation_family:ursa-major |
| tracking_network | 8 | tracking_network:deep-space-network |
| minor_planet_group | 8 | minor_planet_group:main-belt |
| meteorite_group | 8 | meteorite_group:carbonaceous-chondrite |
| antenna | 8 | antenna:seventy-metre |
| mission_operations_center | 8 | mission_operations_center:jpl-sfof |
| method_category | 8 | method_category:astrometry-and-motion |
| galaxy_morphology | 8 | galaxy_morphology:spiral |
| defense_stage | 8 | defense_stage:neo-discovery |
| interstellar_molecule | 8 | interstellar_molecule:water |
| discovery_methodology | 8 | discovery_methodology:the-scientific-method |
| history_theme | 8 | history_theme:the-copernican-revolution |
| exploration_architecture | 8 | exploration_architecture:moon-to-mars-architecture |
| workspace_feature | 8 | workspace_feature:saved-entities |
| solar_region | 8 | solar_region:solar-core |
| coordinate_system | 8 | coordinate_system:celestial-sphere |
| propellant | 7 | propellant:rp1-lox |
| orbit_type | 7 | orbit_type:leo |
| asteroid_family | 7 | asteroid_family:vesta |
| navigation_system | 7 | navigation_system:radiometric-navigation |
| historic_space_event | 7 | historic_space_event:dawn-of-the-space-age |
| record | 7 | record:most-distant-human-made-object |
| exploration_theme | 7 | exploration_theme:lunar-exploration |
| instrument_technique | 7 | instrument_technique:laser-guide-star |
| distance_indicator | 7 | distance_indicator:rr-lyrae |
| ml_method | 7 | ml_method:classification |
| ml_application | 7 | ml_application:galaxy-morphology-classification |
| astrochemical_process | 7 | astrochemical_process:gas-phase-chemistry |
| deep_space_challenge | 7 | deep_space_challenge:the-deep-space-radiation-challenge |
| catalog_family | 7 | catalog_family:deep-sky-visual-catalogs |
| meteor_shower | 6 | meteor_shower:perseids |
| human_spaceflight_program | 6 | human_spaceflight_program:salyut |
| eva | 6 | eva:first-spacewalk-leonov |
| astronomical_theory | 6 | astronomical_theory:geocentrism |
| observational_program | 6 | observational_program:cobe |
| mission_class | 6 | mission_class:flyby |
| institution_type | 6 | institution_type:space-agency |
| galactic_process | 6 | galactic_process:galaxy-evolution |
| cosmic_structure | 6 | cosmic_structure:local-group |
| astrobiology_topic | 6 | astrobiology_topic:origins-of-life |
| biosignature | 6 | biosignature:atmospheric-biosignature |
| space_weather_impact | 6 | space_weather_impact:satellites |
| citizen_science_project | 6 | citizen_science_project:zooniverse |
| amateur_activity | 6 | amateur_activity:backyard-observing |
| observing_equipment | 6 | observing_equipment:binoculars |
| philosophy_of_science | 6 | philosophy_of_science:scientific-realism |
| nucleosynthesis_process | 6 | nucleosynthesis_process:proton-proton-chain |
| research_computing | 6 | research_computing:high-performance-computing |
| astroinformatics_concept | 6 | astroinformatics_concept:scientific-workflows |
| atlas_overlay | 6 | atlas_overlay:constellation-lines-overlay |
| live_data_source | 6 | live_data_source:noaa-swpc |
| astrometric_effect | 6 | astrometric_effect:precession |
| dwarf_planet | 5 | dwarf_planet:pluto |
| cargo_vehicle | 5 | cargo_vehicle:cargo-dragon |
| comet_class | 5 | comet_class:jupiter-family |
| mission_phase | 5 | mission_phase:launch-and-cruise |
| signal_band | 5 | signal_band:s-band |
| space_hazard | 5 | space_hazard:orbital-debris |
| geomagnetic_index | 5 | geomagnetic_index:kp-index |
| space_biology_topic | 5 | space_biology_topic:space-medicine |
| physiological_effect | 5 | physiological_effect:cardiovascular-deconditioning |
| infrastructure_domain | 5 | infrastructure_domain:in-situ-resource-utilisation |
| isru_technique | 5 | isru_technique:water-extraction |
| observation_stage | 5 | observation_stage:discovery |
| habitability_factor | 5 | habitability_factor:liquid-water |
| open_science_practice | 5 | open_science_practice:data-pipelines-and-calibration |
| detector_technology | 5 | detector_technology:ccd |
| mm_channel | 5 | mm_channel:gravitational-waves-and-light |
| interstellar_environment | 5 | interstellar_environment:diffuse-interstellar-medium |
| space_treaty | 5 | space_treaty:outer-space-treaty |
| observing_integration | 5 | observing_integration:weather-integration |
| universe_scene | 5 | universe_scene:solar-system |
| black_hole | 4 | black_hole:sagittarius-a-star |
| space_medicine_topic | 4 | space_medicine_topic:bone-density-loss |
| historical_event | 4 | historical_event:invention-of-the-telescope |
| cosmological_model | 4 | cosmological_model:lambda-cdm |
| seasonal_sky | 4 | seasonal_sky:winter |
| near_earth_object | 4 | near_earth_object:apollo |
| trojan_group | 4 | trojan_group:jupiter-trojans |
| orbital_resonance | 4 | orbital_resonance:jupiter-3-2 |
| meteorite_class | 4 | meteorite_class:chondrite |
| impact_structure | 4 | impact_structure:barringer-crater |
| hyperbolic_comet | 4 | hyperbolic_comet:bowell |
| trajectory_class | 4 | trajectory_class:bound-orbit |
| returned_sample | 4 | returned_sample:itokawa-sample |
| sample_return_capsule | 4 | sample_return_capsule:hayabusa-src |
| ground_station | 4 | ground_station:white-sands |
| communication_system | 4 | communication_system:dsoc |
| radiation_environment | 4 | radiation_environment:cosmic-rays |
| space_manufacturing_process | 4 | space_manufacturing_process:additive-manufacturing |
| agn_type | 4 | agn_type:seyfert-galaxy |
| deflection_method | 4 | deflection_method:kinetic-impactor |
| vo_protocol | 4 | vo_protocol:table-access-protocol |
| interferometry_technique | 4 | interferometry_technique:radio-interferometry |
| cosmological_parameter | 4 | cosmological_parameter:matter-density |
| ml_workflow | 4 | ml_workflow:training-datasets |
| outreach_activity | 4 | outreach_activity:star-party |
| gw_data_product | 4 | gw_data_product:sky-localization-map |
| space_economy_topic | 4 | space_economy_topic:commercial-launch |
| heliosphere_structure | 4 | heliosphere_structure:parker-spiral |
| neutron_star | 4 | neutron_star:crab-pulsar |
| docking_system | 3 | docking_system:probe-and-drogue |
| observing_site | 3 | observing_site:atacama-desert |
| impact_event | 3 | impact_event:chicxulub |
| interstellar_object | 3 | interstellar_object:oumuamua |
| interstellar_detection_method | 3 | interstellar_detection_method:excess-hyperbolic-velocity |
| planetary_protection | 3 | planetary_protection:forward-contamination |
| data_standard | 3 | data_standard:fits |
| gw_detection_method | 3 | gw_detection_method:laser-interferometry |
| gw_followup_stage | 3 | gw_followup_stage:localization |
| planetary_interior | 3 | planetary_interior:core |
| ephemeris_system | 3 | ephemeris_system:jpl-development-ephemeris |
| designation_system | 3 | designation_system:bayer-designation |
| scientific_award | 2 | scientific_award:nobel-prize-physics |
| image_license | 2 | image_license:public-domain |
| small_body_reservoir | 2 | small_body_reservoir:oort-cloud |
| active_asteroid | 2 | active_asteroid:phaethon |
| dormant_comet | 2 | dormant_comet:don-quixote |
| fireball | 2 | fireball:peekskill-fireball |
| recovery_site | 2 | recovery_site:sikhote-alin-field |
| risk_scale | 2 | risk_scale:torino-scale |
| location | 1 | location:solar-system |
| mythology_story | 1 | mythology_story:night-sky |
| life_support_system | 1 | life_support_system:eclss |
| space_experiment | 1 | space_experiment:nasa-twins-study |
| exoplanet_catalogue | 1 | exoplanet_catalogue:nasa-exoplanet-archive |
| habitable_zone_candidate | 1 | habitable_zone_candidate:habitable-zone |
| comet_family | 1 | comet_family:kreutz-sungrazers |
| interstellar_candidate | 1 | interstellar_candidate:cneos-2014-01-08 |
| science_campaign | 1 | science_campaign:aida |
| agn_model | 1 | agn_model:unified-agn-model |
| vo_framework | 1 | vo_framework:the-virtual-observatory |