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You have discovered a new galaxy and you think you have identified an Type II Cepheid...

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Physics

You have discovered a new galaxy and you think you haveidentified an Type II Cepheid star with a period of 30 days. Youmeasure its brightness and with the Period-Luminosity function youcalculate the distance to the galaxy d. However, you later find outthat in fact the star you had identified is a Type I Cepheid. Isthe galaxy further than, or, close to, us than we previouslyexpected? By what factor should you multiply d to get the correctdistance to the new galaxy? [Hint: check the diagram in the slidesfor the Distance Ladder lecture]

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