Is the Moon the only natural satellite of the Earth? Detailed answer

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Is the Moon the only natural satellite of the Earth? Detailed answer

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Is the Moon the only natural satellite of the Earth?

In 1961, two faintly luminous dust clouds were discovered, which are a kind of satellites of the Earth. They are located at the so-called libration points of the Earth-Moon system, that is, at the opposite vertices of two equilateral triangles, each of which has the other two vertices coinciding with the centers of the Earth and the Moon (the triangles have a common side - a straight line segment between the centers of the Earth and the Moon).

The size of the clouds is comparable to the size of the Earth, but their mass is only about 10 thousand tons. The density of clouds is approximately one grain of dust weighing two hundredths of a milligram per cubic kilometer! The angular diameter of the clouds is approximately 10 degrees (about 20 times the lunar diameter).

Circulating around the Earth, the clouds also rotate with a period of about a month around their centers, which oscillate relative to the libration points, moving away from them at a distance of up to 10 angular degrees (when observed from the Earth).

The existence of these dust clouds is explained by the fact that the regions near the libration points of the Earth-Moon system are something like gravitational traps. Separate dust particles spend a long time in them and then fly away, and new particles of interplanetary dust fall into the traps.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

Why do people have different skin colors?

People with the whitest skin can be seen in northern Europe, they are classified as the Nordic type. The people with the blackest skin live in West Africa. The skin of the inhabitants of Southeast Asia is yellowish in color. However, most people are not white, black or yellow, but represent hundreds of shades of light, swarthy or brown.

What is the reason for all these differences in people's skin color? The explanation is in the chemical processes that take place in the body and skin. Skin tissues contain color components called "chromogens" that are themselves colorless. When certain enzymes act on them, the corresponding skin color appears.

Imagine that a person does not have chromogens or his enzymes do not work properly on them. Such a person is called an "albino". It happens to people all over the world. There are albinos in Africa, and they are "whiter" than any white person!

Human skin itself, without any substance, is milky white. But to this is added a shade of yellow due to the presence of yellow pigment in the skin. The other color component of the skin is black, associated with the presence of tiny granules of melanin. This substance is brown in color, but in large quantities it appears black. Another shade is brought into the skin by the red color of the blood circulating through its tiny vessels. The color of the skin of each person depends on the ratio in which these four colors - white, yellow, black and red - are combined. All skin colors of the human race can be produced by various combinations of these color components that we all have.

Sunlight has the ability to form melanin, a black pigment, in the skin. Therefore, people living in the tropics have more of this pigment and darker skin. If you spend a few days in the sun, the sun's UV rays also produce more melanin in your skin, resulting in a suntan!

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Languages of the future 04.01.2018

The British Center for Economics and Business Research, together with Heathrow Airport, conducted a survey among 2 parents of children under the age of 18 and more than 500 business leaders across the UK.

The survey results showed that almost half of the respondents (about 45%) said that their children do not speak any other language than English, and 19% said they were not even interested in their child learning foreign languages. At the same time, every tenth of the respondents admitted that it is too difficult for their children.

The researchers insist that today's children need to learn French, German and Mandarin Chinese in order to be successful in 10 years. According to experts, by 2027, experts in foreign languages will be able to bring the UK economy up to ?500 billion ($650 billion).

Antonella Soras, professor of ontolinguistics at the University of Edinburgh, says: "We believe that learning a language is extremely beneficial for children's development and is a real investment in the future. Children who speak multiple languages are more aware of different cultures, other nations and are more willing to accept someone else's point of view. vision."

In addition, Soras finds that multilingual children are more successful at multitasking and are often more well-read than their monolingual peers.

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