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This definitive visual guide to the Universe explores every aspect of space from the Big Bang to the planets of the Solar System. A comprehensive atlas maps the night sky as it is seen from all parts of the world and at all times of year. Detailed profiles describe and illustrate a huge array of objects, from asteroids and comets to stars and supernovae. Striking images combine with accessible and authoritative text to explain complex concepts clearly and visually.
Our knowledge of Mars has grown enormously over the last decade as a result of the Mars Global Surveyor, Mars Odyssey, Mars Express, and the two Mars Rover missions. This book is a systematic summary of what we have learnt about the geological evolution o Mars as a result of these missions. It describes the diverse Martian surface features and summarizes current ideas as to how, when, and under what conditions they formed, and explores how Earth and Mars differ and why the two planets evolved so differenty. The author also discusses possible implications of the geologic history for the origin and survival of indigenous Martian life. Up-to-date and highly illustrated, this book will be a principal reference for researchers and graduate students in planetar science. The comprehensive list of references will also assist readers in pursuing further information on the subject. Colour images can be found at www.cambridge.org/9780521872010.
High Quality Content by WIKIPEDIA articles! An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud, and are still loosely gravitationally bound to each other. In contrast, globular clusters are very tightly bound by gravity. Open clusters have been found only in spiral and irregular galaxies, in which active star formation is occurring. They are usually less than a few hundred million years old: they become disrupted by close encounters with other clusters and clouds of gas as they orbit the galactic center, as well as losing cluster members through internal close encounters.
In a startling reinterpretation of the evidence, Stillman Drake advances the hypothesis that Galileo’s condemnation by the Inquisition was caused not by his defiance of the Church, but by the hostility of contemporary philosophers. Galileo’s own beautifully lucid arguments are used to show how his scientific method—based on a search not for causes but for laws—was utterly divorced from the Aristotelian approach to physics. His methodology had a definitive impact on the development of modern physics, and led to a final parting of the ways between science and philosophy.
High Quality Content by WIKIPEDIA articles! Stars of different mass and age have varying internal structures. Stellar structure models describe the internal structure of a star in detail and make detailed predictions about the luminosity, the color and the future evolution of the star. Different layers of the stars transport heat up and outwards in different ways, primarily convection and radiative transfer, but thermal conduction is important in white dwarfs. Convection is the dominant mode of energy transport when the temperature gradient is steep enough so that a given parcel of gas within the star will continue to rise if it rises slightly via an adiabatic process.
High Quality Content by WIKIPEDIA articles! Retrograde motion is in the direction opposite to the movement of something else, and is the contrary of direct or prograde motion. The idea of retrograde or prograde motion is useful in three contexts: (1) for describing the orbits of celestial bodies, (2) for describing the rotations of celestial bodies, and (3) for explaining the backtracking by planets which is visible to observers on Earth (See the article: Apparent retrograde motion). In reference to celestial bodies, motion can refer to the orbit of one body about another body or about some other point, or to the rotation of a single body about its axis, or to the precession or nutation of the axis. In reference to celestial systems, retrograde motion usually means motion which is contrary to the rotation of the primary, that is, the object which forms the system's hub.
National Geographic proudly presents the essential reference book for what is now officially a new age in space. In August 2006, the International Astronomical Union redefined the word "planet" and relegated Pluto to the status of a dwarf planet, along with Ceres and Eris. Naturally, National Geographic is there to map out this new view of our solar system. In 11 Planets, David Aguilar, an expert who works on the leading edge of this astounding shift, explains and explores our new galactic knowledge. Using spectacular computer artwork, exclusive to National Geographic, and simple engaging text, this colorful book profiles all 11 planets in our newly categorized solar system: terrestrial Mercury, Venus, Earth, and Mars; gas giants Jupiter, Saturn, Uranus, and Neptune; and dwarf planets Pluto, Ceres, and Eris. The author of the hugely popular Planets, Stars, and Galaxies now leads young minds through into this exciting new view of space, giving readers a vivid "you are...
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