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Stars are astronomical bodies that are (usually) mainly composed of Hydrogen, Helium, and Lithium. They are massive enough that their gravity compresses the matter to the point where nuclear fusion occurs, which creates a lot of heat and tends to make stars output radiation along a blackbody curve. Typically the radiative output is significant in the visible spectrum making stars very bright objects.

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Mass exchange between stars

Stars can exchange mass either by stellar wind, or by Roche lobe overflow: It basically depends on the separation, on the masses, and on the star type. …
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