Science history: 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.
October 2025: Science History from 50, 100 and 150 Years Ago
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December 2024: Science History from 50, 100 and 150 Years Ago
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February 2024: Science History from 50, 100 and 150 Years Ago
