Which method is most appropriate for measuring the distance to a star cluster located 50,000 light-years away in the Milky Way?

Cepheid variables are useful distance indicators within the Milky Way and beyond because their pulsation periods reveal their luminosities. Comparing a Cepheid’s known luminosity with how bright it appears lets astronomers estimate its distance, including at 50,000 light-years. Parallax is generally useful over much shorter distances, while type Ia supernovae and redshift are mainly used for much more distant objects.

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