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In 1923 Edwin Hubble used Cepheid variable stars in photographs of Andromeda to show that it lies outside the Milky Way.

the verdict
SUPPORTED
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Recorded sources
2 sources for · 0 against

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Is it true that in 1923 Edwin Hubble used Cepheid variable stars in photographs of Andromeda to show that it lies outside the Milky Way?

Yes. A NASA account states that Hubble discovered a Cepheid variable star in Andromeda in 1923 and determined it lay far beyond the Milky Way, and a reference discussion likewise says he measured Cepheids in Andromeda to establish it as a separate distant galaxy.

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked

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Evidence for · 2
NASA Celebrates Edwin Hubble's Discovery of a New Universe - NASA ScienceFacebook logoInstagram logo
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NASA Celebrates Edwin Hubble's Discovery of a New Universe - NASA ScienceFacebook logoInstagram logo. (n.d.). science.nasa.gov. https://science.nasa.gov/missions/hubble/nasa-celebrates-edwin-hubbles-discovery-of-a-new-universe/

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More for · 1
How did scientists decide the boundary of the Milky Way at Edwin Hubble times?
2023
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How did scientists decide the boundary of the Milky Way at Edwin Hubble times?. (2023). astronomy.stackexchange.com. https://astronomy.stackexchange.com/questions/54662/how-did-scientists-decide-the-boundary-of-the-milky-way-at-edwin-hubble-times

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