Why Are Cepheid Variables Important

question 76

Multiple Choice

Why are Cepheid variables important?

• A)Cepheid variables are stars that vary in brightness because they harbor a black hole.
• B)Cepheids are pulsating variable stars,and their pulsation periods are directly related to their true luminosities.Hence,we can use Cepheids as "standard candles" for distance measurements.
• C)Cepheids are a type of young galaxy that helps us understand how galaxies form.
• D)Cepheids are supermassive stars that are on the verge of becoming supernovae and therefore allow us to choose candidates to watch if we hope to observe a supernova in the near future.