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A star remains near its initial position on the main sequence until a significant amount of hydrogen in the core has been consumed, then begins to evolve into a more luminous star. (On the HR diagram, the evolving star moves up and to the right of the main sequence.) Thus the main sequence represents the primary hydrogen-burning stage of a star's lifetime.<ref name=tnc/>
 
== Classification ==
Main sequence stars are divided into types
 
* [[O-type main-sequence star]]
* [[B-type main-sequence star]]
* [[A-type main-sequence star]]
* [[G-type main-sequence star]]
* [[F-type main-sequence star]]
* [[K-type main-sequence star]]
* [[M-type star]]
 
==Properties==