The Planets Their Origin And Development Harold C Urey

This is a study based on observation rather than mathematical theory in which an attempt is made to discover facts and relationships that give evidence about the course of solar evolution. The author's principle conclusions are that the earth and other territorial planets were formed at much lower temperatures than has generally been supposed; and that a more uniform distribution of iron throughout the silicate phases of the Earth existed in the past than exist now while the iron core of the Earth has been formed at least partly during geological time. For convenience of discussion the author divides the course of planetary evolution into five stages: stage 1 is assumed to start with an interstellar dust cloud, such as the globes of Bok and Reill; stage 2 he calls the preprotoplanet and protoplanet phase, when temperatures had risen to their present levels; stage 3 is the "high temperature stage", and stage 4 is the second low temperature stage; in his final stage the author outlines possible origins for the atmospheres of the earth, Venus and Mars. It may at first surprise that a physical chemist should write a book on the origin and development of the planets. But as the physical problems are many and involved and as the evidence in regard to them is very detailed, the physical chemist can obviously make valuable contributions to this subject. Mr Urey has discussed his views with astronomers, physicists, geophysicists and many other experts and frequently made use of their critical appreciation.

Harold C. Urey (1893–1981), whose discoveries lie at the foundation of modern science, was one of the most famous American scientists of the twentieth century. Born in rural Indiana, his evolution from small-town farm boy to scientific celebrity made him a symbol and spokesman for American scientific authority. Because he rose to fame alongside the prestige of American science, the story of his life reflects broader changes in the social and intellectual landscape of twentieth-century America. In this, the first ever biography of the chemist, Matthew Shindell shines new light on Urey’s struggles and achievements in a thoughtful exploration of the science, politics, and society of the Cold War era. From Urey’s orthodox religious upbringing to his death in 1981, Shindell follows the scientist through nearly a century of American history: his discovery of deuterium and heavy water earned him the Nobel Prize in 1934, his work on the Manhattan Project helped usher in the atomic age, he initiated a generation of American scientists into the world of quantum physics and chemistry, and he took on the origin of the Moon in NASA’s lunar exploration program. Despite his success, however, Urey had difficulty navigating the nuclear age. In later years he lived in the shadow of the bomb he helped create, plagued by the uncertainties unleashed by the rise of American science and unable to reconcile the consequences of scientific progress with the morality of religion. Tracing Urey’s life through two world wars and the Cold War not only conveys the complex historical relationship between science and religion in the twentieth century, but it also illustrates how these complexities spilled over into the early days of space science. More than a life story, this book immerses readers in the trials and triumphs of an extraordinary man and his extraordinary times.

Harold C. Urey (1893–1981), whose discoveries lie at the foundation of modern science, was one of the most famous American scientists of the twentieth century. Born in rural Indiana, his evolution from small-town farm boy to scientific celebrity made him a symbol and spokesman for American scientific authority. Because he rose to fame alongside the prestige of American science, the story of his life reflects broader changes in the social and intellectual landscape of twentieth-century America. In this, the first ever biography of the chemist, Matthew Shindell shines new light on Urey’s struggles and achievements in a thoughtful exploration of the science, politics, and society of the Cold War era. From Urey’s orthodox religious upbringing to his death in 1981, Shindell follows the scientist through nearly a century of American history: his discovery of deuterium and heavy water earned him the Nobel Prize in 1934, his work on the Manhattan Project helped usher in the atomic age, he initiated a generation of American scientists into the world of quantum physics and chemistry, and he took on the origin of the Moon in NASA’s lunar exploration program. Despite his success, however, Urey had difficulty navigating the nuclear age. In later years he lived in the shadow of the bomb he helped create, plagued by the uncertainties unleashed by the rise of American science and unable to reconcile the consequences of scientific progress with the morality of religion. Tracing Urey’s life through two world wars and the Cold War not only conveys the complex historical relationship between science and religion in the twentieth century, but it also illustrates how these complexities spilled over into the early days of space science. More than a life story, this book immerses readers in the trials and triumphs of an extraordinary man and his extraordinary times.

The Moon is the most viewed object in the sky, the Sun being too bright to look at directly and the planets too far away. The Greeks deduced everything that could be learned about the Moon using only the naked eye, including that it has no light of its own but reflects that of the Sun. They understood the cause of eclipses and used the Earth's shadow on the Moon to conclude that our planet is a sphere and to calculate the size of both the Moon and the Earth. The invention of the telescope some two millennia later offered the opportunity for much greater understanding, but the early observers became sidetracked onto a dead end: First, they fooled themselves into believing that they saw evidence of life on the Moon, even the works of a civilization. Second, they became convinced that the craters of the Moon were volcanoes like those we have on the Earth. These wrong-headed beliefs took centuries to dispel. The origin of the Moon itself has proven an even more difficult question, but scientists have now closed in on the answer. They find that our placid and seemingly unchanging Moon was born in colossal violence as a planet the size of Mars crashed into the primordial Earth and flung off a blob that solidified to become our heavenly companion. Unlocking the Moon's Secrets follows these developments to show how science evolves, complete with misunderstandings, contentious arguments, difficult to relinquish assumptions, and shifting views as new facts come to light. Thanks to the work of generations of determined scientists, we understand our Moon, at last.

On January 20-21, 1964, the Institute for Space Studies of the Goddard Space Flight Center, National Aeronautics and Space Administration, was host to an international group of astronomers, physicists, and Earth scientists, gathered to discuss the Earth-Moon system. This was the sixth in a continuing series of interdisciplinary meetings on topics in space physics held at the Institute. The conference was organ ized by G.J.F. MacDonald, of the University of California at Los Angeles, and by R.H. Dicke, of Princeton University. The working title of the conference was "The Dynamics of the Earth-Moon System," and indeed much of the contents of this proceedings volume is concerned with dynamical problems, but the conference dealt with many other topics concerning the Earth-Moon system, and hence we have adopted the shorter title for this volume. The conference proceedings have been somewhat rear·· ranged from the order in which the papers were actually presented. In doing this the editors are exercising hindsight to bring together closely related discussions. The first paper, by D. Brouwer, discusses the motions and moments of inertia of the Moon and their relation to the lunar figure and composition. From this discussion it emerges there remain many uncertainties in the motion of the Moon associated with the lunar composition and the distribution of its mass.