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Sir Roger Penrose and the Singularity

Sir Roger Penrose and the Singularity

Harald Sack
On August 8, 1931, English mathematical physicist, mathematician and philosopher of science. Sir Roger Penrose was born. Penrose is known for his work in mathematical physics, in particular for his contributions to general relativity and cosmology. In 1969, with Stephen Hawking, Penrose proved that all matter within a black hole collapses to a singularity, a geometric point in space where mass is compressed to infinite density and zero volume. Youth and Education…
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astronomy
Alan Sandage and the Discovery of the Quasars

Alan Sandage and the Discovery of the Quasars

Tabea Tietz
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 Between 1917 and 1922, it became…
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physics
Thomas Gold and the Steady-State Theory

Thomas Gold and the Steady-State Theory

Tabea Tietz
On May 22, 1920, Austrian-born American astrophysicist Thomas Gold was born. Gold was one of three young Cambridge scientists who in the 1950s proposed the now mostly abandoned ‘steady state‘ hypothesis of the universe. His work crossed academic and scientific boundaries, into biophysics, astronomy, aerospace engineering, and geophysics. Thomas Gold – Youth and Education Thomas Gold was born in Vienna, Austria to Max Gold, a wealthy Jewish industrialist (pre-war) who ran one of…
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physics
Alexander Friedmann and the Expanding Universe

Alexander Friedmann and the Expanding Universe

Harald Sack
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 in Saint Petersburg, Russia, to the composer and ballet dancer Alexander Friedmann and the pianist Ludmila Ignatievna Voyachek. However the parents divorced when Alexander…
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