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Cosmic Queries – Life on Other Planets with Aomawa Shields
StarTalk Radio
How Stars Got the Letter Classifications
The letter classifications for stars date back 120 years. They were based on spectra, but quantum physics wasn't yet discovered. The temperature of a star can change the way that spectrum is classified. A B C D E F G H I G A G E L M N O P became O B A F G K M.
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