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Science history: Edwin Hubble uncovers the vastness of the universe with discovery of 'standard candle' — Oct. 5, 1923
https://www.livescience.com/space/astronomy/science-history-edwin-hubble-uncovers-the-vastness-of-the-universe-with-discovery-of-standard-candle-oct-5-1923
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On the night of Oct. 5, 1923, Edwin Hubble observed a strange star that flickered in intensity at regular intervals. The star, dubbed M31-V1, was key to showing that the universe extended far beyond the borders of the Milky Way.
