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killian killian
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10 years ago
What is a Cepheid variable?
A) A type of very luminous star that makes an excellent standard candle
B) A bright source of variable X-ray emission, thought to harbor a supermassive black hole
C) A main-sequence star of spectral type B5
D) A type of galaxy that varies in its light output
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padrepadre
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9 years ago
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killian Author
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9 years ago
Thx man
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