Q. Astronomers use cepheids picipally as measures of what?
Solution:
Cepheid variables can be used to measure distances out to about 30 or 40 megaparsecs with the help of the Hubble Space Telescope. There are also two different types of Cepheid variables, and these two types have different period-luminosity relationships. Nevertheless, these stars are the best tools we have now to measure cosmic distances.
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