Astronomy
Pie Chart of Stars by Spectral Class (Main Sequence)
Last reviewed on 2026-05-22.
Astronomy — verifiable data, editable template
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Main-sequence stars in the Milky Way are dominated by small, cool M-class red dwarfs — roughly 76% of all main-sequence stars. Massive O-class stars are exceedingly rare, accounting for under one in three million.
The data
- M (red dwarf) — 76.45 %
- K (orange) — 12.1 %
- G (yellow, like Sun) — 7.6 %
- F (yellow-white) — 3.0 %
- A (white) — 0.6 %
- B (blue-white) — 0.13 %
- O (blue) — 3e-05 %
Source
Harvard-Smithsonian Center for Astrophysics stellar census.
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