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Cosmic Queries – Life on Other Planets with Aomawa Shields

StarTalk Radio

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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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