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How to Explore Stellar Main-Sequence Lifetime Calculator
Open the Stellar Main-Sequence Lifetime Calculator, drag the mass slider, and watch the probe star trace the mass-lifetime relation across five real stellar types.
- Open https://freetoolonline.com/space-3d/main-sequence-lifetime.html and wait for the starfield and main-sequence curve to render.
- Drag the mass slider to its lowest setting (0.1 solar masses) and watch the probe star settle near the faint, cool end of the curve.
- Drag the slider to the middle and note when the probe lines up with the reference sphere at 1.0 solar mass, the Sun's position.
- Drag the slider to its highest setting (20 solar masses) and watch the probe jump to the hot, blue-white end of the curve.
- Press Reset to the Sun to snap the probe back to 1.0 solar mass at any point.
- Read the facts panel for the probe's live surface temperature, luminosity, and main-sequence lifetime.
Key published figures
| Figure | Value |
|---|---|
| Mass-lifetime scaling | Lifetime proportional to M^-2.5 |
| Sun (reference) | 5,778 K, 1 Lsun, 10 billion years |
| O-type star (20 Msun) | ~30,000 K, ~10,000 Lsun, ~10 million years |
| M dwarf (0.1 Msun) | ~3,000 K, lifetime exceeds the age of the universe |
Next: the when guide or vs alternatives. Open the Stellar Main-Sequence Lifetime Calculator.
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