Edwin Hubble

George Ellery Hale –  Large Telescopes and the Spectroheliograph

George Ellery Hale – Large Telescopes and the Spectroheliograph

On June 29, 1868, American solar astronomer George Ellery Hale was born. He is best known for his discovery of magnetic fields in sunspots, and as the leader or key figure in the planning or construction of several world-leading telescopes, including the 200-inch Hale reflecting telescope at Palomar Observatory. Like buried treasures, the outposts of the universe have beckoned to the adventurous from immemorial times. Princes and potentates, political or industrial, equally…
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Alan Sandage and the Discovery of the Quasars

Alan Sandage and the Discovery of the Quasars

On June 18, 1926, American astronomer Allan Rex Sandage was born. Sandage determined the first reasonably accurate values for the Hubble constant and the age of the universe. Foremost, he is also credited with the discovery of the 3C 48 quasar, i.e. quasi-stellar radio sources which are the most energetic and distant members of a class of objects called active galactic nuclei. The Discovery of Quasars It is believed that the first…
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Alexander Friedmann and the Expanding Universe

Alexander Friedmann and the Expanding Universe

On June 16, 1888, Russian mathematician and physicist Alexander Friedmann was born. Friedmann is best known for his pioneering theory that the universe was expanding, governed by a set of equations he developed now known as the Friedmann equations. The Youth of a Mathematician Alexander Friedmann was born to the composer and ballet dancer Alexander Friedmann and the pianist Ludmila Ignatievna Voyachek. However the parents divorced when Alexander was nine years old,…
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