Hottest to Coolest:
1. O4: The hottest stars, typically blue-white in color.
2. B3: Still very hot, with a bluish-white hue.
3. A0: Hot, white stars.
4. A1: Slightly cooler than A0, still white.
5. F5: Yellow-white stars.
6. G7: Our Sun is a G-type star, yellow in color.
7. K2: Orange stars.
8. K0: Slightly warmer than K2, still orange.
9. M5: The coolest stars, typically red in color.
Explanation:
* Spectral Types: These letters (O, B, A, F, G, K, M) represent a system of classifying stars based on their surface temperature and spectral characteristics.
* Numbers: The numbers following the letters indicate finer subdivisions within each spectral class, with lower numbers representing hotter stars.
Let me know if you'd like more details about specific types!
