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Mark Fisher
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O-type Stars
A category of intensely hot stars, whose surface temperatures range up to 50,000 K (some nine times hotter than the surface of the Sun). O-type stars are a brilliant blue-white in colour, and are relatively rare in comparison with their cooler cousins. The two best known O-type stars in the sky are Alnitak and Mintaka, the two outer stars of Orion's Belt.
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