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Star | Definition, Light, Names, Facts | Britannica Star, any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources This article describes the properties and evolution of individual stars Included in the discussion are the sizes, energetics, temperatures, masses, and chemical compositions of stars
Universe - Galaxies, Stars, Nebulae | Britannica Universe - Galaxies, Stars, Nebulae: The decisive piece of evidence concerning the extragalactic nature of the spirals was provided in 1923–24 by Edwin Hubble, who succeeded in resolving one field in the Andromeda Galaxy (M31) into a collection of distinct stars
Stellar classification | Types, Spectral Classes Luminosity - Britannica stellar classification, scheme for assigning stars to types according to their temperatures as estimated from their spectra The generally accepted system of stellar classification is a combination of two classification schemes: the Harvard system, which is based on the star’s surface temperature, and the MK system, which is based on the star
Star formation and evolution - Encyclopedia Britannica Star - Formation, Evolution, Lifecycle: Throughout the Milky Way Galaxy (and even near the Sun itself), astronomers have discovered stars that are well evolved or even approaching extinction, or both, as well as occasional stars that must be very young or still in the process of formation
Sun | Definition, Composition, Properties, Temperature, Facts The Sun is classified as a G2 V star, with G2 standing for the second hottest stars of the yellow G class—of surface temperature about 5,800 kelvins (K)—and the V representing a main sequence, or dwarf, star, the typical star for this temperature class
Globular cluster | Astronomy, Star Formation Galaxies globular cluster, a large group of old stars that are closely packed in a symmetrical, somewhat spherical form Globular clusters, so called because of their roughly spherical appearance, are the largest and most massive star clusters
Milky Way Galaxy - Structure, Dynamics, Stars | Britannica This structure can be viewed as consisting of six separate parts: (1) a nucleus, (2) a central bulge, (3) a disk (both a thin and a thick disk), (4) spiral arms, (5) a spherical component, and (6) a massive halo Some of these components blend into each other
Sirius | Facts Location | Britannica Sirius, brightest star in the night sky, with apparent visual magnitude −1 46 It is a binary star in the constellation Canis Major The bright component of the binary is a blue-white star 25 4 times as luminous as the Sun
Milky Way Galaxy | Size, Definition, Facts | Britannica This article discusses the structure, properties, and component parts of the Milky Way Galaxy For a full-length discussion of the cosmic universe of which the Galaxy is only a small part, see cosmology For the star system within the Galaxy that is the home of Earth, see solar system