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October 25th in Astronomy and Space Science
Discovery1671Italian-French astronomer Giovanni Cassini discovers Iapetus, a moon of Saturn.
Birth1877American astronomer Henry Norris Russell born. He discovered a correlation between spectral types and absolute magnitudes of stars, which is depicted in the Hertzsprung-Russell diagram. He was instrumental in developing an early theory of stellar evolution and was the first to study light from eclipsing binary stars to determine their masses. Russell also confirmed Cecilia Payne-Gaposchkin's discovery that the stars are composed mostly of hydrogen.
Unmanned Spaceflight1975The Soviet Venera 10 spacecraft lands on Venus and tramsmits data for 65 minutes including temperature, rock density, and wind velocity.
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