Вопрос № 857094 - Английский язык

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In a star there are two main forces: expansion and gravity. In a blue star, when the force of gravity is stronger than the force of expansion the star collapses at its centre. The, the pull of gravity from the centre of the star is so strong that it even swallows the light! This makes the star invisible: a black hole. Around each black hole there is an area called event horizon which emits radiation. There is a black hole at the centre of our galaxy.

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Our solar system is over 4,500 million years old. In a solar system, the sun and the planets form at the same time. They form from a cloud of gases called nebula. A nebula rotates in space and the force of gravity pulls material to its centre. The nebula contracts and its centre gets hot. This hot centre becomes a star.
The outer part of the nebula is not so hot. When the temperature goes down the gases condense into particles of dust. The dust slowly sticks together and forms the planets. Life on our planet begins from the dust of a dying star.  

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Scientists have made the low power reactor to provide arctic stations with a source of light and heat. It is highly specialized reactor. Instead of producing heat that goes to a turbo generator, this reactor produces steam in its own core.
The low power reactor is made portable because it is intended for use at remote stations. Its components can easily be taken apart and reassembled.

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Insulating materials have very low conductivity. They offer extremely high resistance to the flow of current. Insulators are used in electric devices to isolate conductors. Thus they should have a high dielectric strength and a high resistivity. Their mechanical properties are also important for practical use.
Insulators are divided into gaseous, liquid, solid. They are also divided into groups according to their heat resistance.

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More and more companies are turning to automation as a means of production. Used as a way of increasing production many factories have found considerable improvement in their output. Computers or robots do not require holidays, bigger offices, sick pay, pensions, and most importantly, they do not go on strike. Nowadays, a spacious factory needs to employ a total of five staff, one of whom is an engineer, who ensures that the machines operate properly. The owner of a small factory explained that the occurrence of strikes in the past led him to the decision to switch to automatic production. At the height of the industrial disputes with his staff, his company faced closure and he has never regretted dealing with machines instead of people as at least he is still in business.

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The inside of the Earth is very, very hot. Because it is very hot, the rock has melted like ice. It has become liquid, like water. It is always boiling, like water in a kettle. If you have seen the kettle boiling you know that the steam and boiling water try to get out. The very hot melted rock inside the earth also tries to get out. Usually it cannot because the outside of the earth is too thick and strong. But in some places the outside of the earth is thin and weak. Sometimes a crack appears. The hot melted rock pushes up through the crack and bursts through. Steam and gas shoot up into the air and the hot melted lava pours out. Big pieces of rock may be thrown high into the air. After a while the volcano becomes quiet again. The melted lava becomes hard again. Later the same thing happens again and again.