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Lifestyle, Americas, Special Report
#1
POSTSUBSCRIPT should have their internal structure affected by electron-degeneracy as they contract gravitationally after their formation. Those objects should be unable to release enough energy from hydrogen nuclear burning, since their central temperatures begin to decrease after degeneracy proceeds. They should never go through the usual stellar evolution phases, living as ”failed” stars. The theoretical calculations of the two pioneer papers in 1963 marked the birth of brown dwarfs fifty years ago. Following these predictions, the motivation was there for more theoretical calculations and evolutionary models for brown dwarfs Grossman (1970); Straka (1971); Rappaport and Joss (1984), followed by many others. With the discovery of the first genuine brown dwarfs about 20 years ago, (see the chapters by R. Rebolo, G. Basri, and by B. Oppenheimer in this volume), the theory and modelling of brown dwarfs have constantly developed and improved. The first major theoretical challenge was the development of an equation of state (EOS hereafter) appropriate for the description of the dense and relatively cool interior of brown dwarfs, accounting for the effects of electron partial degeneracy and interaction between particles, namely molecules, atoms, ions and electrons (see Chabrier and Baraffe (2000) and references therein).|In the United States National Park System alone there are more than 84 million acres (35 million hectares) of preserved woods, deserts, mountains and other wilderness, so it's no surprise that in the past 100 years there have been a number of cases of hikers going missing. Many of those who vanished were young children and inexperienced hikers, but some were healthy and seasoned outdoorspeople. But is there more to these disappearances than just kids wandering off, or hikers becoming disoriented? What could cause someone to seemingly vanish into thin air? There are two approaches people take to explaining these mysterious disappearances: earthly and supernatural. However, some disappearances have become a focus for urban legend, online message boards and nonfiction books. In fact, "Missing 411" author and former police officer at Yosemite National Park, David Paulides, thinks something more intriguing is afoot. Indeed, most people turn up on their own accord a few days later. Let's be honest - although it might be fun to imagine monsters or something spookier, no proof for any supernatural disappearance has ever been provided.




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