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Loading contentRoughly how long a star burns hydrogen in its core, scaled from the Sun's ~10 billion years. Massive stars are prodigal — a two-solar-mass star lasts under two billion years — while red dwarfs last far longer than the present age of the universe.
Formula: t ≈ 10 Gyr × M^−2.5 (solar units)
With the default inputs, main-sequence lifetime evaluates to 1.7678 Gyr — 2 M☉ → ~1.8 Gyr. The validator recomputes this against the known value on every build, so the formula is checked, not asserted.
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