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'''Supergiants''' are a class of star that are among the most massive and luminous [[star|stars]] found.  The Yerkes spectral classification place supergiants with the luminosity classes of '''1a''' (luminous supergiants), '''lab''' (intermediate luminous supergiants), or '''1b''' (less luminous supergiants).  The largest and most luminous supergiants are termed '''hypergiants''' with a luminosity class of 0, although the term is loosely defined.  Supergiants also vary greatly in their radius, ranging from 30 times the diameter of the [[sun]] to over 1000 times.  

'''Supergiants''' are a class of star that are among the most massive and luminous [[star|stars]] found.  The Yerkes spectral classification place supergiants with the luminosity classes of '''1a''' (luminous supergiants), '''lab''' (intermediate luminous supergiants), or '''1b''' (less luminous supergiants).  The largest and most luminous supergiants are termed '''hypergiants''' with a luminosity class of 0, although the term is loosely defined.  Supergiants also vary greatly in their radius, ranging from 30 times the diameter of the [[sun]] to over 1000 times.