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star : a self-luminous gaseous spheroidal celestial body of great mass which produces energy by means of nuclear fusion reactions — Webster   See also   OneLook


Roget’s II (, Merriam-Webster Thesaurus, Visuwords


Star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, the brightest of which gained proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. However, most of the stars in the Universe, including all stars outside our galaxy, the Milky Way, are invisible to the naked eye from Earth. Indeed, most are invisible from Earth even through the most powerful telescopes. — Wikipedia

Star (Encyclopædia Britannica)




Stellar Astronomy is the study of stars and stellar evolution, and it is fundamental to our understanding of the Universe. The astrophysics of stars has been determined through observation and theoretical understanding; and from computer simulations of the interior. Star formation occurs in dense regions of dust and gas, known as giant molecular clouds. When destabilized, cloud fragments can collapse under the influence of gravity, to form a protostar. A sufficiently dense, and hot, core region will trigger nuclear fusion, thus creating a main-sequence star. — Wikipedia

NASA Goddard (YouTube Channel)

Hypatia Catalog is a multidimensional, amalgamate dataset comprised of stellar elemental abundance measurements for FGKM-type stars within 500 pc of the Sun and all exoplanet host stars regardless of distance. All stellar abundances have been carefully selected from literature sources that measured [Fe/H] and at least one other element. The Hypatia Catalog Database features an interactive table and multiple plotting interfaces that allow easy access and exploration of data within the Hypatia Catalog. In addition, stellar properties and planetary properties, where applicable, have been made available. Data can be downloaded either through the website or through the terminal via our API for use in external plotting routines and data analysis. — Hypatia Catalog

Hypatia Catalog (Official Site)
Hypatia Catalog (Natalie Hinkel)
The Hypatia Catalog Database: A Web-Based Interface for Exploring Stellar Abundances (Natalie R. Hinkel, Dan Burger, arXiv)
Stellar Abundances in the Solar Neighborhood: The Hypatia Catalog (Hinkel et al., ADS, NASA Smithsonian Astrophysical Observatory)

NASA Astrophysics (NASA Science)
Stars and Galaxies (NASA)

Stars (Lunar & Planetary Institute)

Stars (Eric Weisstein’s World of Astronomy, Wolfram Research)
Solar Atmosphere (Eric Weisstein’s World of Astronomy, Wolfram Research)

Stars (Wolfram Alpha)
Star Clusters (Wolfram Alpha)
Star Charts (Wolfram Alpha)


Buying Stars and Star Names (International Astonomical Union)
Naming of Astronomical Objects (International Astonomical Union)
Naming Stars (International Astronomical Union)

GSC-II (Association of Universities for Research in Astronomy)
Guide Star Catalog (Wikipedia)

CNS3 – Gliese Catalog of Nearby Stars, 3rd Edition
Gliese Catalogue of Nearby Stars (Wikipedia)




TED (YouTube Channel)

History of Stars (Universe Today)


Library of Congress # QB799 Stars (UPenn Online Books)

WorldCat, Library of Congress, UPenn Online Books, Open Library




Imagine the Universe (NASA Goddard Space Flight Center)
Stars (Cosmos4Kids)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources



International Astronomical Union (IAU)
American Association of Variable Star Observers


Journal of the American Association of Variable Star Observers
Stars News (Sky & Telescope)
Stars (Astronomy Magazine)
Stars (Science Daily)
Star (
Star (NPR Archives)



Stellar Astronomy (



Minute Physics (YouTube)


OEDILF: The Omnificent English Dictionary In Limerick Form



Explore related posts on Cosma



Here are links to pages about closely related subjects.

Knowledge Realm


Law (Constant) Relativity
Force Gravity, Electromagnetism (Light, Color)
Matter (Microscope) Molecule, Atom (Periodic Table), Particle

Universe (Astronomical Instrument)
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Our Neighborhood
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.