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stars, lifetimes
| type | typical mass (Msun) | surface temp. (°C) | approx. main seq. lifetime (yrs) |
| O | 32 | 35,000 | 10,000,000 |
| B | 6 | 14,000 | 270,000,000 |
| A | 2 | 8,100 | 800,000,000 |
| F | 1.25 | 6,500 | 4,200,000,000 |
| G | 0.9 | 5,400 | 10,000,000,000 |
| K | 0.6 | 4,000 | 32,000,000,000 |
| M | 0.22 | 2,600 | 210,000,000,000 |
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