Main sequence (core hydrogen burning)

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The long stable phase in which a star fuses hydrogen to helium in its core and the outward pressure of that energy release exactly balances its own gravity. It occupies roughly ninety per cent of a star's luminous lifetime, which is why the main sequence is where most stars are found at any moment and why it appears as a diagonal band rather than a scatter on the Hertzsprung-Russell diagram. Position along the band is set almost entirely by mass: the hot, luminous, short-lived stars sit at the top left and the cool, faint, extremely long-lived ones at the bottom right. The phase is self-regulating - a core that runs slightly hot expands and cools, a core that cools contracts and reheats - and that negative feedback is why a star is stable for billions of years rather than oscillating or exploding. Not a place.

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