What internal mechanism allows small red dwarfs (below $0.35 ext{ M}_ ext{sun}$) to consume nearly all their hydrogen fuel?
Answer
Full convection churning energy and matter from the core to the surface
Red dwarfs below $0.35 ext{ M}_ ext{sun}$ are fully convective, meaning helium ash accumulating in the core is constantly mixed with fresh hydrogen from the outer layers, allowing consumption of almost the entire fuel supply.
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