A low-mass star that burns helium in its core and hydrogen in a shell surrounding the core is more luminous than a similar star that burns only hydrogen in a shell around a dead core.

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The Answer of A low-mass star that burns helium in its core and hydrogen in a shell surrounding the core is more luminous than a similar star that burns only hydrogen in a shell around a dead core.

A Low-Mass Star That Burns Helium in Its Core and Hydrogen