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Stellar spectra started with the amount of hydrogen found in the star's spectrum and started with the letters A through Q. What are the current letters used to classify stellar spectra?
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Individuals who confidentially provide information or intelligence to law enforcement agencies, often to help solve crimes.
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Done in a hidden or secretive manner, often to avoid detection.
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The process of asking questions, often formally, to obtain information or a confession from suspects in a legal context.
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