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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
Stars - NASA Science Stars are giant balls of hot gas – mostly hydrogen, with some helium and small amounts of other elements Every star has its own life cycle, ranging from a few million to trillions of years, and its properties change as it ages
Stars in an Exoplanet World - NASA Science Stars are the most basic building blocks of galaxies The age, distribution, and composition of stars trace the history, dynamics, and evolution of their galaxy Stars are responsible for the production and distribution of heavy elements, such as carbon, nitrogen, and oxygen
Star - Wikipedia Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light The most prominent stars have been categorised into constellations and asterisms, and many of the brightest stars have proper names
Star Types - Science@NASA Types of Stars The universe’s stars range in brightness, size, color, and behavior Some types change into others very quickly, while others stay relatively unchanged over trillions of years Main Sequence Stars
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
The Life Cycle of a Star - Encyclopedia Britannica Stars begin their life cycle in molecular clouds, which are dense regions of gas and dust in space These clouds contain clumps of material that can collapse under their own gravity to form protostars The collapse is often triggered by external forces such as shock waves from nearby supernovae As the cloud collapses, it heats up and forms a rotating disk of material around the protostar
Stars - WorldAtlas Stars are massive, luminous spheres of gas, mainly composed of hydrogen, with smaller amounts of helium and other elements The lifespan of a star varies widely, generally ranging from several million to several trillion years
How Are We Made of Star Stuff? We Asked a NASA Expert: Episode 58 The elements in our bodies, the elements that make up our bones, the trees we see outside, the other planets in the solar system, other stars in the galaxy These were all part of stars that existed well before our Sun and Earth and solar system were even formed The universe existed for billions of years before we did