Ultimate visual dictionary

Ultimate visual dictionary.

   THE VISUAL DICTIONARY is a completely new kind of reference book. It provides a link between pictures and words in a way that no ordinary dictionary ever has. Most dictionaries simply tell you what a word means, but the Visual  Dictionary shows you—through a combination of detailed annotations, explicit photographs, and illustrations. In the Visual Dictionary, pictures define the annotations around them. You do not read definitions of the annotated words, you see them. The highly accessible format of the Visual Dictionary, the thoroughness of its annotations, and the range of its subject matter make it a unique and helpful reference tool.




The Milky Way.
The MILKY WAY IS THE NAME GIVEN TO THE FAINT BAND OF LIGHT that stretches across the night sky. This light comes from stars and nebulae in our galaxy, known as the Milky Way Galaxy or simply as “the Galaxy.” The Galaxy is believed to be a barred spiral, with a dense central bar of stars encircled by four arms spiraling outward and surrounded by a less dense halo. We cannot see the spiral shape because the solar system is in one of the spiral arms, the Orion Arm (also called the Local Arm). From our position, the center of the Galaxy is completely obscured by dust clouds; as a result, optical maps give only a limited view of the Galaxy. However, a more complete picture can be obtained by studying radio, infrared, and other radiation. The central part of the Galaxy is relatively small and dense and contains mainly older red and yellow stars. The halo is a less dense region in which the oldest stars are situated; some of these stars are as old as the Galaxy itself (possibly 13 billion years). The spiral arms contain main sequence stars and hot, young, blue stars, as well as nebulae (clouds of dust and gas inside which stars are born). The Galaxy is vast, about 100,000 light-years across (a light-year is about 5,870 billion miles/9,460 billion km); in comparison, the solar system seems small, at about 12 light-hours across (about 8 billion miles/13 billion km). The entire Galaxy is rotating in space, although the inner stars travel faster than those farther out. The Sun, which is about two-thirds out from the center, completes one lap of the Galaxy about every 220 million years.

ОГЛАВЛЕНИЕ.
INTRODUCTION.
THE UNIVERSE.
PREHISTORIC EARTH.
PLANTS.
ANIMALS.
THE HUMAN BODY.
GEOLOGY, GEOGRAPHY, AND METEOROLOGY.
PHYSICS AND CHEMISTRY.
RAIL AND ROAD.
SEA AND AIR.
THE VISUAL ARTS.
ARCHITECTURE.
MUSIC.
SPORTS.
THE MODERN WORLD.
APPENDIX.
INDEX.



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