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Giant star

Main sequence ("dwarfs") Internal structure of a Sun-like star and a red giant. ESO image. A giant star is a star with substantially larger radius and luminosity than a main-sequence star of the same surface temperature. Typically, giant stars have radii between 10 and 100 solar radii and luminosities between 10 and 1,000 times that of the Sun. Stars still more luminous than giants are referred to as supergiants and hypergiants. A hot, luminous main-sequence star may also be referred to as a giant. Apart from this, because of their large radii and luminosities, giant stars lie above the main sequence (luminosity class V in the Yerkes spectral classification) on the Hertzsprungā€“Russell diagram and correspond to luminosity classes II or III. Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
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