What is the solar system? Detailed answer

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What is the solar system? Detailed answer

Big encyclopedia for children and adults

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What is the solar system?

Probably, you have heard about "flying saucers" and unusual creatures - aliens from other worlds. The veracity of such reports is questioned, but the very possibility of such phenomena is undoubted. The fact is that our solar system is just a tiny part of a huge universe in which millions of other solar systems similar to ours can exist. The concept of the solar system includes the sun and all the bodies revolving around it under the influence of its attraction. Our solar system is made up of planets, satellites, asteroids and comets, all of which are influenced by the Sun's gravitational pull.

Earth is one of the planets, of which there are only nine. The planets are very different from each other in size and many other parameters and are separated from the Sun by different distances.

Mercury is the smallest and closest planet to the Sun. It completes one revolution around the Sun in just 88 days.

Next to it is Venus, which is 108 million kilometers away from the Sun and revolves around it in 225 days.

Earth is the third planet from the Sun, located at a distance of 149,5 million kilometers from it.

Then comes Mars, which is located about 228 million km from the Sun, and its period of revolution is 687 days.

Next comes the largest planet in the solar system - Jupiter, which makes a complete revolution in almost 12 years, and the next Saturn - in 29,5 years.

The last three planets - Uranus, Neptune and Pluto are so far from the Sun that they are even invisible to the naked eye.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What happened to animals during the Ice Age?

The Ice Age is a time in the history of the Earth, when huge masses of ice that moved in from the north covered vast regions of the earth's surface. In that era, a thick layer of ice occupied most of North America, Europe and western Siberia. When did it happen? The process, which lasted a very long time, began about 1 years ago.

When did the ice age end? It is different in different regions of the Earth. In the north of Europe in Russia, for example - just a few millennia ago.

However, in some regions it continues to this day: Greenland is still almost entirely covered with ice. The icy desert stretched over an area of millions of square kilometers. In Europe, its border passed through the territory of modern England, Germany, Romania, and the south of Russia.

With the approach of powerful glaciers, most of the animals had to go south. Those who could not withstand the new cold climate either moved to warmer regions or died out. The wild animals that now live in the territories that have undergone this ordeal are just a pitiful remnant of the rich animal life that existed there before the onset of the ice age. Man has managed to adapt to the changing climate.

Perhaps the cold snap even played a significant role in the development of his mental abilities, since, in order to survive in more difficult conditions, he had to show ingenuity and resourcefulness. Plants also migrated to the south, away from the onset of cold weather. Some of them returned when the glaciers melted, but many species simply disappeared from the face of the Earth.

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Thinness genes 20.04.2012

Geneticists from France, Switzerland and England, having examined the genomes of several tens of thousands of people, found on the 16th chromosome a group of 28 genes that determine the weight of a person.

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It turned out that none of them had a triple set of "thinness genes", but some of these genes had only one copy. Those with this mutation are 43 times more likely to be severely obese than normal. True, the 16th chromosome is to blame for only one percent of all cases of obesity.

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