Back to Stars and Nebulae Starlight - Main Sequence - O - B - A - F - G - K - M - Luminosity Classes - Spectral Class Codes |
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A class main sequence stars burn much more brightly than the Sun. They exhaust their hydrogen in around 100 million years. Like F and G stars, they pass through a series of Red Giant phases. Their spent cores become White Dwarfs.
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