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Stephen Hawking and the Hairy Black Holes

Stephen Hawking and the Hairy Black Holes

Harald Sack
When I read the news that Stephen Hawking passed away, I was rather sad. I grew up with a fascination for astronomy and cosmology. Trying to understand the fabrics and working of the universe, I devoured his popular books and articles and I am rather thankful. Amongst others it was foremost this unique physicist, who planted the seed for my decision to become a scientist myself. However, I abandoned physics after high…
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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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