# Chapter 1. Luminosity of Variable Stars

Map Learning Exercises

### Question What is the luminosity of a Cepheid variable star with the longest possible pulsation period?

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{"title":"selection","description":"All RR Lyrae variable stars are about the same luminosity, regardless of their pulsation period. Therefore, if we see a RR Lyrae variable, and we know how bright it actually looks, we can easily tell how far away it is. These are important stars to astronomers.","type":"correct","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"28,133,418,181\"}]"} {"title":"selection COPY","description":"Incorrect","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"31,182,421,237\"}]"} {"title":"selection COPY COPY","description":"Incorrect","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"32,245,422,305\"}]"} {"title":"selection COPY COPY COPY","description":"Incorrect","type":"incorrect","color":"#ffffff","code":"[{\"shape\":\"rect\",\"coords\":\"39,310,429,395\"}]"}
Correct.