Cepheid variable stars were used to determine the distance to which galaxy?

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Multiple Choice

Cepheid variable stars were used to determine the distance to which galaxy?

Explanation:
Cepheid variable stars pulsate in a way that ties their intrinsic brightness to their pulsation period. By measuring how long their brightness takes to vary, you infer how luminous they truly are, and comparing that to how bright they appear from Earth gives their distance. This makes Cepheids excellent standard candles for gauging distances to nearby galaxies. The Andromeda Galaxy was the historic breakthrough: astronomers observed Cepheids there, calculated its distance, and showed Andromeda lies far outside the Milky Way, proving it is a separate galaxy and helping set the scale of the universe. The Large Magellanic Cloud is especially important as a calibration step for the period-luminosity relation, but the famous distance determination using Cepheids is to Andromeda.

Cepheid variable stars pulsate in a way that ties their intrinsic brightness to their pulsation period. By measuring how long their brightness takes to vary, you infer how luminous they truly are, and comparing that to how bright they appear from Earth gives their distance. This makes Cepheids excellent standard candles for gauging distances to nearby galaxies. The Andromeda Galaxy was the historic breakthrough: astronomers observed Cepheids there, calculated its distance, and showed Andromeda lies far outside the Milky Way, proving it is a separate galaxy and helping set the scale of the universe. The Large Magellanic Cloud is especially important as a calibration step for the period-luminosity relation, but the famous distance determination using Cepheids is to Andromeda.

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