Links
Useful general links regarding astrophpysics.
Astronomy sites for children:
All About Astronomy: from Enchanted Learning, includes pages on various astronomy terms.
Astronomy Answers: Hyperlinked dictionary and more.
Astronomy for Kids: from Ducksters.
Little Astronomy
StarDate
Universe Guide: astronomy facts as well as info on entertainment.
General astronomy/astrophysics glossaries:
Acronomy: searchable list of astronomy acronyms.
Acronyms: list at HEASARC.
Astronomical Glossary: from Astronomy Know How.
Astronomy Dictionary: from Astronomy - The Guide To The Universe.
Astronomy Terms: from Sky & Telescope.
Astrophysics and Cosmic Engine Glossary: from Australia Telescope National Facility.
Dumb Astronomy Acronyms
Encyclopedia for non-astronomers: from anisotropela.
Eric Weisstein's World of Astronomy: from Eric Weisstein's World of Science.
ESA/Hubble Word Bank: from ESA/Hubble.
Glossary: from Rubin Observatory Education.
Glossary: from NASA HUBBLESITE.
Glossary: by the IAU Office for Astronomy Education.
Glossary: from TEACH Astronomy.
Glossary of Astronomical and Cosmological Terms: from Ned Wright's Cosmology Tutorial.
Glossary of Astronomical Terms: from NOVAC.
Glossary of Astronomical Terms: from Binocular Sky.
Glossary of astronomy: from Wikipedia.
Glossary of Astronomy Terms: from Sea and Sky's Astronomy Reference Guide.
Glossary of Astrophysics Terms: from Simulating eXtreme Spacetimes.
Glossary of Radio Astronomy Terms: from National Radio Astronomy Observatory.
Glossary of Terms: from The Physics of the Universe.
Heliopedia: glossary of the Sun, from NASA.
List of astronomical terms: from Wictionary.
List of astronomy acronyms: from Wikipedia.
Space Terms: from Planet Facts.
A to Z of Astronomy: from Astronomy for Beginners.
Unified Astronomy Thesaurus: from the American Astronomy Society.
Other general astronomy/astrophysics sites:
anistopela
APOD: Astronomy Picture of the Day, from NASA.
Astronomical Catalogue Designations: (downloads) from The IET.
Astronomical sub-disciplines: from Wikipedia.
Astronomy Articles: from Wikipedia.
The Astronomy Cafe
Astronomy Encylopedia: at HellenicaWorld which also has one on physics.
Astronomy On Tap: Lectures.
AstronomyOnline.org
Astronoo
Astrophysics articles: from Wikipedia.
Astrophysics for Senior Physics: HS-level astrophysics material from Australia Telescope National Facility.
Astrophysics Terms flashcards: from Quizlet.
Burnham's Celestial Handbook Data sheet: including a catalog list.
Catalogues List
Curious About Astronomy? Ask an Astronomer
Deep Sky Object Catalogs Commonly Referenced by Astronomers
DOCdb: Deep Sky Observer's Companion.
Galaxy Map
Galaxy Zoo
Guide to Space: from Universe Today.
Latest Supernovae: recent info collected
List of astronomical catalogues: from Wikipedia.
List of common astronomy symbols: from Wikipedia.
List of Common Deep Sky Catalogs: and abbreviations.
List of constellations: from Wikipedia.
One hundred nearest star systems: from RECONS.
Online Astronomy Text
Outline of astronomy: from Wikipedia.
Planetary science articles: from Wikipedia.
Prefix Explanations
Skyview: Virtual telescope from NASA.
Spectroscopic Atlas for Amateur Astronomers
Stars
Stars and Planets
World Wide Telescope: web and app-based virtual view of sky.
Research/academic astronomy/astrophysics glossaries:
An Etymological Dictionary of Astronomy and Astrophysics
Astronomical Eponyms: from the NOIRlab.
Astronomical Glossary: from NED Level 5.
Astronomical glossary
Astronomy/Physics Glossary
COSMOS: Encyclopedia of astronomy from Swinburne University.
Dictionary of Nomenclature of Celestial Objects: from the Strasbourg astronomical Data Center.
Glossary: from Astronomy Notes.
Spanish-English Astronomy Dictionary: equivalent terms.
Other research/academic astronomy/astrophysics sites:
AAS Nova: online summaries of select AAS journal articles.
ARIBIB: astronomy/astrophysics bibliography
arXiv.org > astro-ph: Shared astrophysics research papers in arXiv.org.
Astro 801: Planets, Stars, Galaxies and the Universe: Course Homepage from Penn State, 12 lessons.
AstroBaki: astrophysics tutorial collaborations. (slow)
AstroBetter: shared research tips.
Astrobites: summaries of select astro-ph papers.
Astronomy: Online astronomy textbooks from openstax.org.
Astronomy & Cosmology: Online astronomy textbooks from LibreTexts.
Astronomy Books Online: list of free online books from Science Books Online.
Astronomy Notes
Astrophysic Source Code Library
Astrophysics: from HyperPhysics, includes pages on various astronomy/astrophysics terms.
Astrophysics Books: list of free online books from Science Books Online.
Astrophysics Spectator
Catalogues, Atlases, Positions: from NED Level 5.
Encyclopedia of Astrophysics: from Scholarpedia.
Essential Equations: for the NRAO Essential Radio Astronomy course.
Exoplanet Orbit Database
FAST Stellar Atlas: sample stellar SEDs
Free Astronomy Books: list by FreeBookCentre.net.
GAVO Data Center: from German Astrophysical Virtual Observatory.
Gene Smith's Astronomy Tutorial
HEASARC: High Energy Astrophysics Science Archive Research Center.
Images, Catalogs, & Atlases: online, from NED Level 5.
International Virtual Observatory Alliance: cooperative astronomical database.
Introduction to astrophysics: from Wikiversity.
LAMBDA: Legacy Archive for Microwave Background Data Analysis
Naming of Astronomical Objects: from the International Astronomical Union.
The NASA/IPAC Extragalactic Database: (NED)
NED Level 5: hyperlinked collection of research findings from NED (The NASA/IPAC Extragalactic Database).
Radiometry and photometry in astronomy FAQ
Random notes: from anisotropela.
SAO/NASA Astrophysics Data System: (ADS) database of research papers.
SIMBAD: from the Strasbourg astronomical Data Center.
Sloan Digital Sky Survey
Some Useful Astronomical Definitions
Stelle Doppie: Double Star Database search.
The Ultimate Cheat Sheet for Astrophysics Students: equations.
VizieR: Online astronomical catalog contents/data, from the Strasbourg astronomical Data Center.
Related sciences glossaries:
David Darling Encyclopedia of Science: from daviddarling.info.
Encyclopedia Astronautica: space probes/exploration.
Eric Weisstein's World of Math
Geology Dictionary
Glossary - Introductory Chemistry: from BCcampus Open Publishing.
Glossary of Aerospace Terms: from NASA Glenn Learning Technologies Project.
Glossary of chemistry terms: from Wikipedia.
Glossary of geology: from Wikipedia.
Glossary of Meteorology: American Meteorological Society (AMS).
Glossary of meteorology: from Wikipedia.
Glossary of physics: from Wikipedia.
Glossary of Terms (Geology)
National Weather Service Glossary
Quantum Physics Lady: glossary.
Other related sciences sites:
arXiv: research paper preprints.
Chemistry: Online chemistry textbooks from LibreTexts.
Eric Weisstein's World of Science
FreeBookCentre.net: online books including science.
Gunter's Space Page: info regarding many spacecraft and missions
HyperPhysics
Index of geology articles: from Wikipedia.
Index of meteorology articles: from Wikipedia.
Index of physics articles: from Wikipedia.
LibreTexts: online textbooks including science.
Mathematics: Online math textbooks from LibreTexts.
Meteorology & Climate Science: Online meteorology textbooks from LibreTexts.
Online Index of Objects Launched into Outer Space: maintained by the United Nations Office for Outer Space Affairs.
openstax.org: online textbooks including science.
Physics: Online physics textbooks from LibreTexts.
Physics: magazine on current research from the American Physical Society.
Physics FAQ: Physicists tackle questions folks wonder about.
The Physics Hypertextbook
The Physics of the Universe
Physics Pages
Review of the Universe: Structures, Evolutions, Observations, and Theories.
School:Chemistry: from Wikiversity.
Science Books Online
Science Clarified
Theoretical Minimum: online modern physics lectures.
Theoretical Physics, the Universe, and Everything: cosmology-related topics with references.
Glossary: from Astronomy & Astrophysics.
Index