In which specific astronomical object did Hubble confirm the existence of Cepheids to prove it was an external galaxy?
Answer
The Andromeda Nebula (M31)
In 1923 and 1924, Hubble identified Cepheid variable stars within the Andromeda Nebula (M31). His calculations proved that this object was millions of light-years away, positioning it far outside the Milky Way.
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