SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/astro-massive-stars-short-lives

Which kind of star stays on the main sequence longer?

Low-mass stars. Massive stars burn fuel so fast they live far shorter lives.

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  1. Low-mass stars ✔
  2. High-mass stars
  3. They all last the same time

Why: A massive star has more fuel but burns it much faster. A 40 solar mass O star lasts about 1 million years, the Sun about 10 billion, and a 0.4 solar mass M star about 200 billion.

Huh, didn't know that: A 0.4 solar mass star's main-sequence lifetime is longer than the current age of the universe.

The dad joke
Massive stars live fast and burn bright. Little red dwarfs just take it slow and steady.
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References

Answer: Low-mass stars. A massive star has more fuel but burns it much faster. A 40 solar mass O star lasts about 1 million years, the Sun about 10 billion, and a 0.4 solar mass M star about 200 billion.

  1. Astronomy 2e, 22.1 Evolution from the Main Sequence to Red Giants openstax.org/books/astronomy-2e/pages/22-1-evolution-from-the-main-sequence-to-red-giants
    Although massive stars have more fuel, they burn it so prodigiously that their lifetimes are much shorter than those of their low-mass counterparts.
    Checked 2026-10-10.

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