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Transcript: Working early in the twentieth century physicist Marie Curie was able to show that radioactive processes released millions of times more energy per atom than any chemical process known. Marie Curie was a pioneer. With her husband she was the first to isolate a radioactive element. She was the first female professor in the six hundred year history of the Sorbonne. She was the first person ever to win two Nobel Prizes; however Marie and many others who worked on radioactivity paid heavily for being pioneers. Unaware of the damaging effects of radiation on human skin and tissue they died from radioactive poisoning.
Transcript: Physicists in the nineteenth century made various estimates of the age of the Sun, but they were fundamentally unaware of the most efficient energy source known. Early in the twentieth century physicists Rutherford and Becquerel began a systematic study of the phenomenon of...
Published 07/24/11
Transcript: Chemical energy cannot power the Sun, so what is the energy source? Inspired by an idea by the German physicist Hermann von Helmholtz the English physicist Lord Kelvin explored the idea of gravitational contraction. In this mechanism the Sun is slowly shrinking and gravitational...
Published 07/24/11
Transcript: Above the solar chromosphere is the corona, a diffuse outer layer of gas at the amazing temperature of two million degrees Kelvin. Both the chromosphere and the corona have higher temperatures than the photosphere. How can this be? One way for gas to become hot is pressure. Higher...
Published 07/24/11