November 2025: Science History from 50, 100 and 150 Years Ago

Arianespace to launch EU's Copernicus Sentinel-1D satellite on November 4, 2025, with Ariane 6

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