The sun – the central body of the solar system – is a hot plasma ball. The sun is the star closest to Earth. The light from it reaches us in 8.3 minutes. The sun has decisively influenced the formation of all the bodies of the solar system and created the conditions that led to the emergence and development of life on Earth. Its mass is 333,000 times the mass of the Earth and 750 times the mass of all other planets combined. Over the 5 billion years of the sun’s existence, already about half of the hydrogen in its central part has turned into helium. As a result of this process, the amount of energy that the sun radiates into world space is released. The radiation power of the Sun is very large: about 3.8 * 10 20 degrees MW. An insignificant part of solar energy, about half a billionth of a billion, falls on Earth. It maintains the earth’s Continue reading
And now the nebula has acquired a completely different look. A huge dark, slightly flattened cloud rotates majestically in the middle, and around it at different distances floating in circular orbits located approximately in the same plane, small “satellite clouds” detached from it. Follow the central cloud. It continues to condense. But now a new force begins to struggle with the force of gravity – the force of gas pressure. Indeed, in the middle of the cloud, more and more particles of matter are accumulating. There arises a “terrible crowding” and an “incredible crush” of particles. They rush about, striking each other harder. In the language of physicists, temperature and pressure rise in the center. At first it gets warm, then hot. Outside, we don’t notice this: the cloud is huge and opaque. Heat does not come out. But something Continue reading
Despite the high level of astronomical information of the peoples of the ancient East, their views on the structure of the world were limited to direct visual sensations. Therefore, in Babylon, views have developed that the Earth has the appearance of a convex island surrounded by the ocean. Inside the Earth, as if there is a “kingdom of the dead.” The sky is a solid dome resting on the earth’s surface and separating the “lower waters” (the ocean flowing around the earth’s island) from the “upper” (rain) waters. Celestial bodies are attached to this dome, as if gods live above the sky. The sun rises in the morning, leaving the eastern gate, and sets through the western gate, and at night it moves underground.
According to the ideas of the ancient Egyptians, the Universe looks like a large valley, stretched from north to south, in the center of it is Egypt. The sky was likened to a large iron roof, which is supported on pillars, on it in Continue reading