Walter Baade
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High Quality Content by WIKIPEDIA articles! Wilhelm Heinrich Walter Baade (March 24, 1893 June 25, 1960) was a German astronomer who emigrated to the USA in 1931. He took advantage of wartime blackout conditions during World War II, which reduced light pollution at Mount Wilson Observatory, to resolve stars in the center of the Andromeda galaxy for the first time, which led him to define distinct "populations" for stars (Population I and Population II). The same observations led him to discover that there are two types of Cepheid variable stars. This discovery led him to recalculate the size…mehr

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High Quality Content by WIKIPEDIA articles! Wilhelm Heinrich Walter Baade (March 24, 1893 June 25, 1960) was a German astronomer who emigrated to the USA in 1931. He took advantage of wartime blackout conditions during World War II, which reduced light pollution at Mount Wilson Observatory, to resolve stars in the center of the Andromeda galaxy for the first time, which led him to define distinct "populations" for stars (Population I and Population II). The same observations led him to discover that there are two types of Cepheid variable stars. This discovery led him to recalculate the size of the known universe, doubling the previous calculation made by Hubble in 1929. He announced this finding to considerable astonishment at the 1952 meeting of the International Astronomical Union in Rome.