Полнотекстовый поиск:
Где искать:
только в названии
только в тексте
слова в тексте
только заголовок

Рекомендуем ознакомиться

Остальные работы
What processes allow us to take a jumbled set of lines and colours that enter our eye, and transform them into a meaningful representation of the worl...полностью>>
Остальные работы
Kosovo is a southern province of Serbia, the core of the former Yugoslavia. Slobodan Milosevic is currently president of Yugoslavia. He has been presi...полностью>>
Остальные работы
I am now at the age where I must begin to pay for the way I treated my mother. My daughter is just like me....полностью>>
Остальные работы
From 1784 to 175 Napoleon attended the Ecole Militarie in Paris. So the wars of the French Revolution gave him the opportunity to test his skills....полностью>>


Сохрани ссылку в одной из сетей:


In Roman mythology Mercury is messenger of the gods, and son of the god Jupiter. Mercury is the planet closest to the sun. Its distance from the sun is approximately 58 million km (about 36 million miles); its diameter is 4875 km (3030 miles); its volume and mass are about : that of the earth; and its density is approximately equal to that of the earth. Mercury revolves about the sun in a period of 88 days. Radar observations of the planet show that its period of rotation is 58.7 days, or two-thirds of its period of revolution. The planet, therefore, rotates one and a half times during each revolution. Because its surface consists of rough, porous, dark-colored rock, Mercury is a poor reflector of sunlight. Mercury is the second smallest planet in the solar system and it has no known moons.

Spectroscopic studies indicate that only an extremely thin atmosphere, containing sodium and potassium. Collisions with other protoplanets early in the history of the solar system may have stripped away lighter materials, thereby accounting for Mercury’s great density. The force of gravity on the planet’s surface is about one-third of that on earth’s surface.

The Mariner 10 spacecraft passed Mercury twice in 1974 and once in 1975. It sent back pictures of a moonlike, crater-pocked surface and reported temperatures to be about 430. C (about 810. F) on the sunlit side and about -180. C (about -290. F) on the dark side. It s atmosphere consists of sodium, helium, hydrogen, and oxygen. Mariner 10 also detected a magnetic field 1 percent that of the earth. Unlike that of the earth’s moon, the surface of Mercury is criss-crossed by long escarpments, dating perhaps from the period of contraction the planet experienced as it cooled some time early in its history. In 1991 powerful radio telescopes on earth revealed unmistakable signals of vast sheets of ice in Mercury’s polar regions, areas that had not been covered by Mariner 10.

Похожие страницы:

  1. Усні теми з англійської мови

    Сочинение >> Иностранный язык
    ... in mineral resources, such as bituminous coal, rock salt, clay, mercury ... of Liberty in front, demonstrates furniture and porcelain. Each room presents a ... has become a leading paper in the moral boost of ... are engaged in the research work. But still in some ...
  2. Intrnational MKT Research Canada Essay Research Paper

    Реферат >> Остальные работы
    Intrnational MKT Research Canada Essay, Research Paper TABLE OF CONTENTS Preface ... 1997. In addition, machinery and equipment investment should remain strong as ... for polychlorinated biphenyls (PCBs), mercury chlordane and dichloro-diphenyl-trichlorethane ...
  3. Asia Essay Research Paper AsiaAsia is the

    Реферат >> Остальные работы
    Asia Essay, Research Paper Asia Asia is the largest ... a typical Mediterranean climate and receives rain in winter; average annual precipitation along ... world deposits of chromium, manganese, mercury, selenium, tellurium, tungsten, zinc, graphite ...
  4. Mining Dictionary Essay Research Paper Dictionary

    Реферат >> Остальные работы
    Mining Dictionary Essay, Research Paper Dictionary of Mining Engineering Nihat ... Amalgation : 1) Gold is treated with mercury in order to obtain amalgam on ... , or other similar excavation in a mine 2) Stope, a room which is a wide working ...
  5. Kama Sutra Essay Research Paper PREFACEIN the

    Реферат >> Остальные работы
    Kama Sutra Essay, Research Paper PREFACE IN the literature of all ... of Ravana is told in the Ramayana, which with the Mahabarata ... his friend, should await in his room, previously decorated and perfumed ... some of the talents of Mercury, but with less activity ...

Хочу больше похожих работ...