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Science · Earth sciences
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30,000 10,000 -- 3000 1000|- % 3 10 period (days) 30 100 This figure shows the Cepheid period-luminosity relation. A Cepheid star with a period of 30 days has the same apparent brightness as a nearby G2 star. How many times further away is the Cepheid star? C C C C The Cepheid star is 100 times further away than the nearby G2 star. The Cepheid star is 10 times further away than the nearby G2 star The Cepheid star is 10,000 times further away than the nearby G2 star. The Cepheid star is actually a factor of 10 times closer than the nearby G2 star.

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