Concept
Spectral Classification (OBAFGKM)
Stars sorted by surface temperature.
The Harvard system classifying stars from hottest to coolest as O, B, A, F, G, K, M, with subdivisions 0–9. The Sun is type G2V.
Overview
The Harvard system classifying stars from hottest to coolest as O, B, A, F, G, K, M, with subdivisions 0–9. The Sun is type G2V.
See also
Exoplanets
Worlds orbiting other stars.
The Habitable Zone
Where liquid water can exist on a planet's surface.
Stellar Life Cycle
How stars are born, live, and die.
Reionization Epoch
When the first stars and galaxies relit the universe.
Stellar Nucleosynthesis
Stars forging the chemical elements.
Moving Group
Stars sharing a common motion through the galaxy.