Is it far from the sun? Detailed answer

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Is it far from the sun? Detailed answer

Big encyclopedia for children and adults

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Is it far from the sun?

How to find out the distance to the Sun? And in general, how to determine the distance to an object, if it is impossible to get closer to it? People have come up with ways by which you can not only determine the distance to some inaccessible object, but also find out the distance to celestial bodies - to the Moon, to the Sun, to the stars. This required knowledge of mathematics and very precise measuring instruments.

Astronomers determine the distance to the heavenly bodies in the same way as artillerymen determine the distance to the target. The object, the distance to which must be determined, is considered simultaneously from two different places. Knowing the distance between the observation points and the angle between the directions to the target, you can calculate the distance to it. Making observations of celestial bodies from two different points on the globe, astronomers calculated the distance to the Sun, Moon, and planets.

From the Earth to the Sun is almost 150 million kilometers. A beam of light travels this distance in 8 minutes 20 seconds. In nature, there is no greater speed than the speed of light - 300 kilometers per second. No body, no particle can move faster. But if suddenly our Sun went out, then we on Earth would know about it only after 000 minutes 8 seconds, because it is at a great distance from us.

Author: Cellarius E.Yu.

Random interesting fact from the Great Encyclopedia:

How many continents have a Mediterranean climate?

The Mediterranean climate - with moderate temperatures, mild winters and very rare precipitation in summer, as you might guess from the name, is inherent in the territories on the Mediterranean coast. However, not only them: according to the international classification, the Mediterranean climate is also inherent in the California coast, the western coasts of South Africa and Chile, the southwestern coast of Australia, as well as some places on the Black Sea - for example, Anapa or Tuapse.

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Random news from the Archive

Cooling heart attack 28.11.2010

A decrease in body temperature protects the heart in case of a heart attack.

One of the methods of dealing with a heart attack is the so-called emergency coronary balloon angioplasty: a catheter is inserted into a vessel on the thigh or on the arm, brought to the site of the blockage of the coronary artery, where the balloon expanding it is inflated. After that, the blood can flow freely again. Such an operation takes time, but it just doesn’t exist, since the heart muscle left without food is rapidly dying.

You can slow down the process by lowering your body temperature. But how to do that? Scientists from Lund University, led by Professor David Erlinge, have developed the following technique. As soon as possible after a heart attack, a person is injected with saline cooled to 35°C. Rapidly spreading through the blood vessels, it enters the heart and cools it. After cooling, the operation is performed with a cold catheter.

As a result, the survival of patients with a heart attack increased by a third. Both cooling and angioplasty are performed without anesthesia, and the person does not feel much discomfort. Delighted by the success of the Swedish cardiologists are going to start extensive testing of their method.

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