Where did we come from? Before there was life there had to be something to live on - a planet, a solar system. During the past 200 years, astronomers and geologists have developed and tested several different theories about the origin of the solar system and the nature of the Earth. Did the Earth and other planets form as a by-product of a natural process that formed the Sun? Did the solar system come into being as the result of catastrophic encounter of two stars? Is the inside of the Earth solid, liquid or gaseous? The three volumes that make up A History of Modern Planetary Physics present a survey of these theories. Nebulous Earth follows the development of the nineteenth-century's most popular explanation for the origin of the solar system, Laplace's Nebular Hypothesis. This theory supposes that a flattened mass of gas extending beyond Neptune's orbit cooled and shrank, throwing off in the process successive rings that in time coalesced to form several planets.
Scientists and policymakers have realized that localities are central to addressing the causes and consequences of global environmental change. The goal of the Human-Environment Regional Observatory project (HERO) was to develop the infrastructure necessary to monitor and understand the local dimensions of global change. This book presents the philosophy behind HERO, the methods used to put that philosophy into action, its results, and the lessons learned from the project. HERO used three strategies: it developed research protocols and data standards for collecting data; it built a web-based networking environment to help investigators share data, analyses and ideas from remote locations; and investigators field-tested these concepts by applying them in diverse biophysical and socioeconomic settings - central Massachusetts, central Pennsylvania, southwestern Kansas, and the US-Mexico border region of Arizona. The book highlights the unique focus of HERO regarding thinking and acting on complex, integrative, and interdisciplinary global change science at local scales, and is valuable for global change scientists.
Galaxy reading books are a wonderful collection of fiction, non-fiction, poetry and plays to capture the interest of every child, helping to develop a life-long love of reading. Ethan and his Dad take the train from their village to visit the city for the day. The city is busy and they see lots of exciting things. Which part of the day will Ethan like the most? Reading age: 5-6 years
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