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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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James Sadler – the First English Aeronaut

James Sadler – the First English Aeronaut

On February 27, 1753, English chemist, pastry chef, and aviation pioneer James Sadler was born. He is best known for being the first English aeronaut, whose first successful ascent was on 4 Oct 1784, in a hot-air balloon, from Christ Church Meadow, Oxford. England’s 2nd Balloonist Sadler worked as a pastry chef in the family business, The Lemon Hall Refreshment House, a small shop in Oxford. He was the second known person in…
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Jacques Charles and the Hydrogen Balloon

Jacques Charles and the Hydrogen Balloon

On November 12, 1746, French inventor, scientist, mathematician, and balloonist Jacques Alexandre César Charles was born. Charles and the Robert brothers launched the world‘s first (unmanned) hydrogen-filled balloon in August 1783. In December 1783, Charles and his co-pilot Nicolas-Louis Robert ascended to a height of about 500 metres in a manned balloon. Their pioneering use of hydrogen for lift led to this type of balloon being named a Charlière (as opposed to a…
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Henri Giffard and the Giffard Dirigible

Henri Giffard and the Giffard Dirigible

On February 8, 1825, French engineer and aviation pioneer Baptiste Henri Jacques Giffard was born. He is best known for being the first who succeeded to build a steam powered and steerable aircraft, the Giffard dirigible. Henri Giffard – From Locomotives to Ballons Henri Giffard was born in Paris. The tinkerer was enthusiastic about steam engines. After studying at the Collège royal de Bourbon, he began working as a technical draftsman for the…
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Victor Franz Hess and the Cosmic Radiation

Victor Franz Hess and the Cosmic Radiation

On August 7, 1912, Austrian physicist Victor Franz Hess provided evidence of a high-altitude radiation in one of his balloon rides, which later was called cosmic radiation. Together with Carl Anderson, he received the 1936 Nobel Prize in Physics for the discovery of cosmic radiation. What causes Ionization of the Air? Victor Franz Hess was educated in Graz, Austria. There, he attended the grammar school and the University of Graz. At the Physical…
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