By Jacob Darwin Hamblin
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Extra info for Science in the Early Twentieth Century: An Encyclopedia (History of Science)
Example text
Elements 99 and 100 were not discovered through cyclotron bombardment, but as the residue of a more powerful force: the hydrogen bomb. Named einsteinium and fermium—after Albert Einstein (1879–1955) and Enrico Fermi (1901–1954)—these elements were found after the 1952 thermonuclear test on the Pacific atoll Eniwetok. S. nuclear weapons research resulted in the identification of elements 93 through 101, and Seaborg dominated these activities. He shared the Nobel Prize in Physics with Edwin McMillan for these efforts in 1951.
Estimates of the earth’s age needed to be revised to account for radioactive processes. This source of heat would provide the earth with a great deal of staying power, far into both the past and the future. But even after Becquerel’s Age of the Earth 3 Lord Kelvin reading in his study. Even after Becquerel's discovery of radioactivity, Kelvin estimated the earth's age—based on its rate of cooling—at fewer than 40 million years. (National Library of Medicine) discovery of radioactivity, Kelvin estimated the earth’s age, based on its rate of cooling, at fewer than 40 million years.
Yerkes Observatory, 1892–1950: The Birth, Near Death, and Resurrection of a Scientific Research Institution. Chicago: University of Chicago Press, 1997. Wright, Helen. James Lick’s Monument: The Saga of Captain Richard Floyd and the Building of the Lick Observatory. New York: Cambridge University Press, 1987. Astrophysics Astrophysics is a branch of astronomy that deals primarily with dynamic relationships and physical structures. It came to prominence before the twentieth century and was substantially helped by the development of new technology.