Sources Policy

Primary & reference sources

The primary and reference sources this topic draws on.

• NASANational Aeronautics and Space Administration

  Mission data, planetary science, space telescopes, and public-domain imagery.

  Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.

• NASA JPLJet Propulsion Laboratory / Solar System Dynamics

  Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.

• ESAEuropean Space Agency

  European missions, observatories, and space science imagery.

• CSACanadian Space Agency

  Canadian missions, instruments, and contributions to international programs.

• JAXAJapan Aerospace Exploration Agency

  Japanese missions (Hayabusa, Akatsuki) and space science.

• RoscosmosState Space Corporation Roscosmos

  Russian crewed and robotic spaceflight history and programs.

• ISROIndian Space Research Organisation

  Indian missions (Chandrayaan, Mangalyaan) and launch vehicles.

• IAUInternational Astronomical Union

  Official naming, definitions, constellation boundaries, and astronomical nomenclature.

• Minor Planet CenterIAU Minor Planet Center

  Designations and orbits of asteroids, comets, and minor bodies.

• US Naval ObservatoryUnited States Naval Observatory

  Precise time, almanac data, Sun/Moon rise-set, and phases.

• IMOInternational Meteor Organization

  Meteor shower activity, radiants, and peak forecasts.

• NSF NOIRLabNSF National Optical-Infrared Astronomy Research Laboratory

  Ground-based optical/infrared observatory data and imagery.

• ESOEuropean Southern Observatory

  Southern-hemisphere observatory data and imagery (VLT, ALMA partner).

• SIMBADCentre de données astronomiques de Strasbourg (CDS)

  Reference database of astronomical objects, identifiers, and measurements.

• NEDNASA/IPAC Extragalactic Database

  Reference database for extragalactic objects (galaxies, quasars).

• NASA ADSNASA Astrophysics Data System

  Bibliographic index of peer-reviewed astronomy and astrophysics literature.

• HipparcosESA Hipparcos space astrometry mission

  High-precision parallax, magnitude, and position for ~118,000 stars.

• GaiaESA Gaia astrometric survey

  Billion-star astrometry, photometry, and distances (future identifier support).

• AsteriaStar (derived)AsteriaStar Scientific Data Engine — values computed from cited source inputs via documented standard formulae

  Derived/calculated values (gravity, escape velocity, bulk density, axis ratio, mission duration) whose inputs and formula are fully traced.

• WikidataWikidata (Wikimedia Foundation) — community-curated structured knowledge base

  Structured mission/spacecraft facts (international designator, operator, manufacturer, launch mass); statements link to their own citations where provided.

• HYG DatabaseHYG Database (Hipparcos + Yale Bright Star + Gliese), by D. Nash / astronexus

  Aggregated, openly-licensed star catalogue combining Hipparcos, the Yale Bright Star Catalogue, and the Gliese Catalogue of Nearby Stars.

• OpenNGCOpenNGC (M. Verga) — NGC/IC, Messier, and Caldwell catalogue data

  Openly-licensed deep-sky catalogue: object types, positions, magnitudes, sizes, morphology, and cross-identifiers.

• BritannicaEncyclopaedia Britannica

  General reference for the history of astronomy, biographies, and cultural context.

• The Nobel PrizeThe Nobel Foundation

  Official record of Nobel laureates, prize motivations, and award years.

• Planck CollaborationESA Planck mission / Planck Collaboration

  Cosmic microwave background maps and the cosmological parameters of the ΛCDM model.

• LIGO Scientific CollaborationLIGO Scientific Collaboration & Virgo Collaboration

  Direct detections of gravitational waves from compact-object mergers.

• Event Horizon TelescopeEvent Horizon Telescope Collaboration

  Horizon-scale images of supermassive black holes (M87*, Sagittarius A*).

• ESA EuclidESA Euclid mission

  Wide-field mapping of dark matter and dark energy via weak lensing and galaxy clustering.

• DESIDark Energy Spectroscopic Instrument

  Spectroscopic redshift survey measuring baryon acoustic oscillations and dark energy.

• SDSSSloan Digital Sky Survey

  Multi-wavelength survey of galaxies, quasars, and large-scale structure.

• NOAA SWPCNOAA Space Weather Prediction Center

  Space-weather forecasts and alerts: aurora (OVATION), the Kp index, and the G1–G5 geomagnetic storm scale.

• NOAA Solar CalculatorNOAA Global Monitoring Laboratory

  Public-domain solar-position geometry: sunrise, sunset, solar noon, twilight, declination, and the equation of time.

  Public domain (US Government work).

• NASA DONKINASA Community Coordinated Modeling Center

  The Space Weather Database Of Notifications, Knowledge, Information: solar flares, CMEs, and geomagnetic storms.

• CelesTrakCelesTrak (Dr. T. S. Kelso)

  Two-line orbital elements (TLEs) for satellites including the ISS, used with a propagator to predict passes.

• STScISpace Telescope Science Institute

  Science operations and public image archives for the Hubble and James Webb space telescopes (MAST, HubbleSite, webbtelescope.org).

  Hubble/Webb images released by NASA/STScI are generally free to use with a credit line; each item's terms are checked before use.

• ESA/HubbleESA/Hubble (European Space Agency)

  The European Hubble image archive and press releases.

  ESA/Hubble images are generally licensed CC BY 4.0; attribution is required.

• ESA/WebbESA/Webb (European Space Agency)

  The European James Webb Space Telescope image archive and press releases.

  ESA/Webb images are generally licensed CC BY 4.0; attribution is required.

• Wikimedia CommonsWikimedia Foundation

  Openly licensed and public-domain space imagery.

  Each file's license (public domain or Creative Commons) and attribution are recorded before use.

• SpaceXSpace Exploration Technologies Corp.

  Falcon 9, Falcon Heavy, Starship, and the Merlin/Raptor engines — manufacturer specifications and launch data.

• ArianespaceArianespace SA

  Ariane and Vega launch-vehicle families — user's manuals and mission data.

• ULAUnited Launch Alliance

  Atlas V, Delta IV, and Vulcan Centaur — manufacturer specifications and mission data.

• Rocket LabRocket Lab USA, Inc.

  Electron, Neutron, and the Rutherford/Archimedes engines — manufacturer specifications.

• Blue OriginBlue Origin, LLC

  New Shepard, New Glenn, and the BE-3/BE-4 engines — manufacturer specifications.

• Gunter's Space PageGunter Krebs — Gunter's Space Page

  A specialist reference compilation of launch vehicles, stages, and spacecraft across all spacefaring nations.