What makes the earth revolve around the sun? Detailed answer

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What makes the earth revolve around the sun? Detailed answer

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What makes the earth revolve around the sun?

Let's start by determining what makes the Earth and other planets move. According to one of the theories about the origin of the solar system, about 5 billion years ago, a huge cloud of dust formed and began to rotate. It turned into a disk, and the hot central mass became the Sun. The outer parts of the dust cloud turned into separate swirling masses, from which the planets then formed.

And now the planets, one of which is the Earth, continue to rotate. And why the Earth and other planets do not fly away into open space? This is prevented by the gravity, or attraction, of the Sun. According to Newton's laws of motion, a moving object tries to continue its movement in a straight line until it is acted upon by extraneous forces. Therefore, moving planets tend to fly away from the Sun in a straight line. But external forces prevent this, keep the planets in their orbits. These external forces are solar gravity, that is, solar attraction.

Each planet moves in its own orbit and the speed of its movement depends on its distance from the Sun. The planet moves faster when it is closer to the Sun and slower when it moves away from it. The Earth moves at a speed of 30,2 km/s when it is closest to the Sun, and at a speed of 29,2 km/s when it is at its furthest from it. As the planet orbits closer to the Sun, the Sun's gravitational pull is stronger; when it moves away, the gravitational pull weakens. Greater gravity causes a greater speed of the planet. For example, Mercury moves at an average speed of 47,9 km/s, and Pluto at an average speed of 4,6 km/s.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Where, besides Australia, can you find kangaroos in the wild?

Kangaroos in the wild are found not only in Australia. Small colonies of red-grey wallabies also exist in several European countries, such as England and Scotland. A group of about 30 wallabies lives in the Rambouillet Forest, 50 km from Paris. Almost all of these colonies formed after one or more pairs of kangaroos escaped from zoos.

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