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 Hertzsprung–Russell diagram and correspond to luminosity classes II or III.
Famous quotes containing the words giant and/or star:
“Long ago the country bore the country-town and nourished it with her best blood. Now the giant city sucks the country dry, insatiably and incessantly demanding and devouring fresh streams of men, till it wearies and dies in the midst of an almost uninhabited waste of country.”
—Oswald Spengler (1880–1936)
“You’re not a star until they can spell your name in Karachi.”
—Humphrey Bogart (1899–1957)