Question No.280

Answer : 1924

Explanation

Edwin Hubble confirmed that the Andromeda Nebula was a separate galaxy in 1924. Using the 100-inch Hooker Telescope at Mount Wilson Observatory, he identified Cepheid variable stars in Andromeda, which allowed him to measure its distance. His calculations showed it was far too distant to be part of the Milky Way, proving it was a distinct galaxy.

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