Mass planets

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  • An extrasolar planet or exoplanet is a planet orbiting a star (or remnant of a star) beyond our Solar System. As of autumn 2007, about 250 exoplanets had been discovered around 220 different stars, including nearly two dozen multiple planet systems. No less than five exoplanets have been discovered orbiting the star 55 Cancri; one of the planets has nearly four times the mass of Jupiter, another is comparable with Jupiter in mass, two are slightly less massive than Saturn, while the innermost planet has a mass similar to that of Uranus....

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  • The radiation of the sun in which the planet is incessantly plunged, penetrates the air, the earth, and the waters; its elements are divided, change direction in every way, and, penetrating the mass of the globe, would raise its temperature more and more, if the heat acquired were not exactly balanced by that which escapes in rays from all points of the surface and expands through the sky.

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  • As of June 2002, astronomers had discovered more than 100 other planets orbiting distant suns. With advances in tech- nology, that number will surely increase during the opening decades of the twenty-first century. Although our explorations of the Cosmos hold great promise of future discoveries, among all of the known worlds, Earth remains unique. Thus far it is the only known planet with blue skies, warm seas, and life.

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  • Oceanography is a very complex science. Its field study, the knowledge of the oceans and the seas and their physical and biological characteristics, is fundamental to comprehend many oceanographic and ecological aspects that directly influence the human life and the planet health. From micro-scale, like coastal processes, to macro-scale, like Global Change, the oceans, the seas and the marine life, play the main role to maintain the earth equilibrium, both from a physical and a chemical point of view (e.g. carbon cycle and water masses dynamic)....

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  • Abstract: “Brown dwarfs” is the collective name for objects more massive than giant planets such as Jupiter but less massive than M dwarf stars. This review gives a brief description of the classification and chemistry of low mass dwarfs. The current spectral classification of stars includes L and T dwarfs that encompass the coolest known stars and substellar objects. The relatively low atmospheric temperatures and high total pressures in substellar dwarfs lead to molecular gas and condensate chemistry.

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  • How can you tell if a technology has reached critical mass? Easy: you look at how much damage it’s causing. Pretty much every human invention is neutral in itself; any benefits (or drawbacks) come from the way it’s used: atomic energy can be used to power a city or destroy it; cars make it travel over distances that were unthinkable just a hundred years ago possible, and are happily destroying our planet with their polluting emissions.

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  • Physical theories allow us to make predictions: given a complete description of a physical system, we can predict the outcome of some measurements. This problem of predicting the result of measurements is called the modelization problem, the simulation problem, or the forward problem. The inverse problem consists of using the actual result of some measurements to infer the values of the parameters that characterize the system. While the forward problemhas (in deterministic physics) a unique solution, the inverse problem does not.

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  • Having explored and mapped our planet's land masses, vast oceans and the space surrounding it, science is turning inward to the challenging and controversial mapping of the human genome, a collection of genes forming DNA. Each of our genes is a single instruction for the make-up of an individual being. The more we learn, the more we discover to explore - and the more controversy we release in the process.

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  • Astronomy is the most ancient science humans have practiced on Earth. It is a science of extremes and of large numbers: extremes of time – from the big bang to infinity –, of distances, of temperatures, of density and masses, of magnetic field, etc.

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  • Since the time of Newton the basic structure of the solar system and the laws that govern the motions of the bodies within it have been well understood. One central body, the Sun, containing most of the mass of the system has a family of attendant planets in more-or-less circular orbits about it. In their turn some of the planets have accompanying satellites, including the Earth with its single satellite, the Moon. With improvements in telescope technology, and more recently through space research, knowledge of the solar system has grown apace.

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  • IF YOU will look at any good map of Venus you will see that the land mass called Anlap lies northwest of the island of Vepaja, from which Duare and I had just escaped. On Anlap lies Korva, the friendly country toward which I pointed the nose of our plane. Of course there is no good map of Venus, at least none that I ever have seen; because the scientists of the southern hemisphere of the planet, the hemisphere to which Chance carried my rocket ship, have an erroneous conception of the shape of their world. They believe that Amtor, as they call it, is shaped like a...

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  • Four hundred years ago, the Universe changed. Or, at least, our perception of it did, thanks to Galileo Galilei’s scrutiny of the night sky with a telescope. Within a couple of years, his observations of the Moon, phases of Venus and satellites of Jupiter shattered the old Ptolemaic model of our Solar System. To the church’s dismay, Earth assumed its rightful place as one of several planets orbiting the Sun (see page 28). Marking Galileo’s anniversary, the International Year of Astronomy seeks to remind us of the humbling nature of gazing at the heavens.

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