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The common use of "dwarf" to mean the main sequence is confusing in another way because there are dwarf stars that are not main-sequence stars. For example, a [[white dwarf]] is the dead core left over after a star has shed its outer layers, and is much smaller than a main-sequence star, roughly the size of [[Earth]]. These represent the final evolutionary stage of many main-sequence stars.<ref name=wd_sao/>
=='''''Parameters'''''==
[[File:Morgan-Keenan spectral classification.svg|thumb|right|upright=1.2|Comparison of main sequence stars of each spectral class]]
By treating the star as an idealized energy radiator known as a [[black body]], the luminosity ''L'' and radius ''R'' can be related to the [[effective temperature]] ''T''<sub>eff</sub> by the [[Stefan–Boltzmann law]]:
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