Stellar Spectral Types: OBAFGKM Explanation:
Astronomers divide stars into different spectral types. First started in the 1800s, the spectral type was originally meant to classify the strength of hydrogen absorption lines. A few types that best describe the temperature of the star remain in use today. The seven main spectral types OBAFGKM are shown above with the spectrum of a single. [KPNO 0.9-m Telescope, AURA, NOAO, NSF ]
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