Pocket Visual Dictionary, 2017

Pocket Visual Dictionary, 2017.

   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.

Pocket Visual Dictionary, 2017


Neutron stars and black holes.
NEUTRON STARS AND BLACK HOLES form from the stellar cores that remain after stars have exploded as supernovae (see pp. 26-27). If the remaining core is between about one and a half and three solar masses, it contracts to form a neutron star. If the remaining core is greater than about three solar masses, it contracts to form a black hole. Neutron stars are typically only about 10 kilometres in diameter and consist almost entirely of subatomic particles called neutrons. Such stars are so dense that a teaspoonful would weigh about a billion tonnes. Neutron stars are observed as pulsars, so-called because they rotate rapidly and emit two beams of radio waves, which sweep across the sky and are detected as short pulses. Black holes are characterized by their extremely strong gravity, which is so powerful that not even light can escape; as a result, black holes are invisible. However, they can be detected if they have a close companion star. The gravity of the black hole pulls gas from the other star, forming an accretion disc that spirals around the black hole at high speed, heating up and emitting radiation. Eventually, the matter spirals in to cross the event horizon (the boundary of the black hole), thereby disappearing from the visible Universe.

CONTENTS.
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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2024-04-15 01:05:26