Ejnar Hertzsprung

Modern Planetary Science with Gerard Kuiper

Modern Planetary Science with Gerard Kuiper

On December 7, 1905, Dutch-American astronomer Gerard Peter Kuiper was born. Considered by many to be the father of modern planetary science, Kuiper is the eponymous namesake of the Kuiper belt, a region of the Solar System beyond the planets, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun. Kuiper also discovered Miranda, a moon of Uranus, and Nereid, a moon of Neptune. “The Kuiper Belt…
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Harlow Shapley and the Size of the Milky Way

Harlow Shapley and the Size of the Milky Way

On November 2, 1885, American astronomer Harlow Shapley was born. Shapley is best know for having correctly estimated the size of the Milky Way Galaxy and the sun’s position within it. Harlow Shapley – Early Years Harlow Shapley was born in Nashville, Missouri and dropped out of school after fifth grade. However, later on he managed to return to school and complete a six-year high school program in only two years. At…
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Ejnar Hertzsprung and the Hertzsprung-Russell Diagram

Ejnar Hertzsprung and the Hertzsprung-Russell Diagram

On October 8, 1873, Danish chemist and astronomer Ejnar Hertzsprung was born. Together with Henry Norris Russell, Hertzsprung developed the Hertzsprung–Russell diagram, a scatter graph of stars showing the relationship between the stars‘ absolute magnitudes or luminosities versus their spectral classifications or effective temperatures, which has become fundamental to the study of stellar evolution. Ejnar Hertzsprung – Early Years Ejnar Hertzsprung was probably not formally educated, but studied in technological colleges in Denmark…
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