Astronomy Resources
Space Agencies & Institutions
- NASA — Space exploration, imagery, and scientific research
- ESA — European Space Agency
- JPL — Jet Propulsion Laboratory — solar system data and missions
- STScI / Hubble — Hubble and James Webb Space Telescope imagery
- ESO — European Southern Observatory
Observing Organizations
- AAVSO — American Association of Variable Star Observers — variable star data, charts, and observing programs
- Astronomical League — Federation of amateur astronomical societies — observing programs and awards
- British Astronomical Association — Observing sections for variable stars, deep sky, planets, and more
- Royal Astronomical Society of Canada — One of the oldest astronomical organizations in the world, with observing programs and publications
- International Dark-Sky Association — Light pollution awareness and dark sky preservation
Databases & Catalogs
- SIMBAD — CDS astronomical object database — identifications, coordinates, and bibliography
- NED — NASA/IPAC Extragalactic Database
- VizieR — Astronomical catalog service with over 20,000 catalogs
- Washington Double Star Catalog — Comprehensive double and multiple star data
Magazines & News
- Sky & Telescope — The essential magazine for amateur astronomy since 1941
- Astronomy Magazine — Observing guides, equipment reviews, and science news
- Universe Today — Space and astronomy news
- Space.com — Space exploration and astronomy coverage
- Actual Astronomy — Podcast and community for amateur visual astronomers
Tools & Software
- Stellarium — Free open-source planetarium for desktop and mobile
- Heavens-Above — Satellite pass predictions and sky charts
- CelesTrak — Satellite orbital elements and tracking data
- Astrometry.net — Automatic plate solving for astrophotography
Imaging & Community
- Astrobin — Astrophotography image hosting and community
- Cloudy Nights — Telescope reviews, forums, and observing reports
- Astronomy Picture of the Day — Daily curated astronomy image from NASA