The Main Sequence

The HR Diagram is used to provide a categorization of stars based upon their temperature and luminosity. When plotted, very distinct regions become apparent. In the series on the HR Diagram, this video will focus on the Main Sequence. This is where stars will spend most of their life.
The definition of Main Sequence is a star fusing Hydrogen into Helium in its core. Once Helium fusion begins, the star leaves the Main Sequence.

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