EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Albert Einstein (1879-1955), Swiss-German physicist (right), with US astronomer Harlow Shapley (1885-1972). Einstein received the 1921 Nobel Prize for Physics for work on the photoelectric effect. However, he is best known for his paper on the special theory of relativity, which resulted in the famous equation E=mc2. Shapely studied the distribution of Cepheid stars in globular clusters (huge spherical star clusters). From his work he was able to determine that the Milky Way was disc-shaped, that globular clusters were distributed around its centre both above and below the disc, and that the Sun was a considerable distance from the centre.
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