FACTOID # 23: Wisconsin has more metal fabricators per capita than any other state.
 
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Encyclopedia > Main sequence
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H-R diagram - Wikipedia (411 words)
Actually, there are very metal-poor stars (subdwarfs[?]) that lie just below the main sequence although they are fusing hydrogen, thus marking the lower edge of the main sequence's fuzzyness due to chemical compositon.
Stars usually enter and leave the main sequence from above when they are born or they are starting to die, respectively.
In the lower-left is where white dwarfs are found, and above the main sequence are the red giants and supergiants.
main sequence (240 words)
A star on the main sequence is one that is generating light and heat by the conversion of hydrogen to helium by nuclear fusion in its core.
A star's position and length of stay on the main sequence depend critically on mass.
The least massive, hydrogen-burning stars, the red dwarfs, sit to the lower right and may remain on the main sequence for hundreds of billions of years.
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