Here is a general level presentation about Georges Lemaitre who was one of the pioneers in studying the possibility that the universe is expanding. He is now regarded as a "Father of the Big Bang" This topic is also addressed in my book , Heart of Darkness - Unraveling the Mysteries of the Invisible Universe

Georges Lemaitre: Life, Science and Legacy Presentation given at an Ordinary Meeting of the Royal Astronomical Society on 11 November 2016

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Simon Mitton's exciting presentation often given to amateur astronomy societies is on the Fireworks Universe of Georges Lemaitre, and the early history of exploding models of the universe. Other cosmologists who feature in this talk are Alexander Friedman, Vesto Slipher, Edwin Hubble, Arthur Eddington, Fred Hoyle, Tommy Gold, Hermann Bondi, and Allan Sandage. The final part of the talk shows how dark matter and dark energy feature in modern convergence cosmology. This topic is also addressed in my latest book with Princeton University Press, Heart of Darkness - Unraveling the Mysteries of the Invisible Universe

Georges Lemaitre: The Fireworks Universe

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Here is a short presentation titled Cambridge Scientific Minds. Includes William Gilbert, William Harvey, Isaac Newton, Arthur Eddington, and Fred Hoyle. It is used as an introduction to a tour of the Whipple Museum of the History of Science

Cambridge Scientific Minds

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Here is something completely different, an interesting enquiry of the impact of the cosmology of Bishop Robert Grosseteste (1175-1253), also Plato, Aristotle, Hipparchus of Niceae, Ptolemy of Alexandria, and Nicolaus Copernicus. Scholars are elevating Grosseteste as a major natural philosopher in the thirteenth century. Bishop Grosseteste University in Lincoln, UK is named after him.

Geometry and cosmology in Antiquity and the Middle Ages

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Simon Mitton's presentation at the Hay-on-Wye Festival in 2011 which was a sell-out. Hay Festival 2011

The books are Ptolemy's Almagest (140 AD), Copernicus' De Revolutionibus (1543), Galileo's Sidereus Nuncius - the Starry Message (1610) and Dialogo (1636), and Newton's Principia Mathematica (1687). These are the great books that moved the study of the heavens from capricious Greek gods and their myths to the truth of mathematics and physics.

Five Books that changed our view of the universe

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Here's Simon Mitton's presentation on Fred Hoyle given in 2011. It's a lively account of a lively life! Hoyle was an extremely accomplished nuclear astrophysicist who established that we are all made of stardust.

Fred Hoyle A life in science: 1915 - 2001

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