What primary nuclear process are K-type main-sequence stars performing in their cores?
Answer
They are fusing hydrogen into helium.
K-type stars are classified as main-sequence stars, which signifies that they are in the longest and most stable phase of their stellar life cycle. During this phase, the defining characteristic is sustained thermonuclear fusion occurring in the star's core. For stars like the Sun and K-types, this process involves converting the lighter element, hydrogen, into the slightly heavier element, helium. This sustained energy generation through core fusion is what provides the outward pressure balancing the inward force of gravity, maintaining hydrostatic equilibrium.
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