Ninety percent of all stars fuse helium to form carbon and lie on the main sequence.

Name: Ninety percent of all stars fuse helium to form carbon and lie on the main sequence.
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Most stars on the main sequence fuse hydrogen into helium, not helium into carbon. Helium fusion into carbon primarily occurs in older, more evolved stars that have left the main sequence to become red giants or supergiants.

Ninety Percent of All Stars Fuse Helium to Form Carbon