how does a main-sequence star's lifetime depend on its overall mass
Main sequence In general, the more massive a star is, the shorter its lifespan on the main sequence. After the hydrogen fuel at the core has been consumed, the star evolves away from the main sequence on the HR diagram. The behavior of a star now depends on its mass, with stars below 0.23 Mâ˜‰ becoming white dwarfs directly, whereas stars with up to ten solar masses pass through a red giant stage.[3] More massive stars can explode as a supernova,[4] or collapse directly into a black hole.
Alonso Álvarez de Pineda
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Hubble sequence Our own Milky Way is generally classed as SBb or SBc[14], making it a barred spiral with well-defined arms.