Earth introduction

Earth introduction

The Earth is the third planet of the eight planets of the solar system, with a satellite moon (commonly known as the moon) between Venus and Mars. The distance between the earth and the sun is set to be a unit of a day, about 150 million kilometers. The Earth is the largest of the first four rockies and the most dense of the solar system. The Earth is also the only place where organisms and large amounts of oxygen are currently found. The age of the Earth is about 4.55 billion years, perhaps the same as the age of the solar system.

Earth’s topographical appearance

Earth introduction

The greatest feature of the earth is that it is the only planet in the solar system with liquid water on its surface. About 70% of the surface is covered by the ocean, so it can nourish life. Looking back at the Earth from space, you can see that the earth is a beautiful blue planet that surrounds the atmosphere. There are white clouds in the atmosphere.

In addition to the ocean, it is a land that occupies less land. The distribution of land on Earth can be seen in space. As the weathering progresses, many meteorite structures like the moon and the surface of Mercury will not be seen on Earth. In addition to the large craters, the meteorite impact marks on the earth will gradually become weathered and disappear. Even so, the surface of the earth still retains many large geological structures.

Looking at the earth from space, there is virtually no way to see man-made structures on the ground such as buildings, pyramids, and even the Great Wall, known as the largest building.

Earth’s surface environment

The Earth is currently the only place in the solar system that has been found in the solar system (2007). The surface temperature is around -60 to 50 degrees, and it is not too hot or cold. Since the earth’s rotation axis has a slope of 23.44 degrees, there are four seasons. When the sun is shining directly into the northern hemisphere, the northern hemisphere is summer, and when the sun is shining directly into the southern hemisphere, the northern hemisphere is winter.

The movement of the earth’s plates is still very frequent, and earthquakes often occur, releasing energy. The slab movement of the thin plate-like crust with horizontal convection is also an important feature of the earth. The material circulation caused by plate motion has a great influence on the appearance of the earth.

Some people may ask why the sister star, Venus, which is similar in size to the Earth, is so much worse than the Earth’s environment? The reason may be the result of the irreversible greenhouse effect. It is speculated that the composition of the original Venus is similar to that of the Earth. However, due to the excessive carbon dioxide contained in the atmosphere, the greenhouse effect causes the temperature to rise, and the carbon dioxide in the earth’s crust is also explained. More carbon dioxide continues to deepen the greenhouse effect. As a result, it is impossible to turn back, so it is called an irreversible reaction.

Earth’s astral structure

The structure inside the earth can be roughly divided into two parts – the earth’s crust, the earth’s core, and the earth’s core. The crust and the earth’s core are composed of citrate, and the core is composed of a liquid (external) and a solid (internal) iron-nickel alloy.

The thermal convection inside the Earth is still frequent, and the activity of the earthquake volcano is still everywhere. Since Taiwan is in the earthquake zone, the people of Taiwan should be one of the most people who feel the earthquake in the world.

Earth’s atmospheric structure

The pressure on Earth is about one atmosphere. Mainly composed of nitrogen and oxygen. There are white clouds formed by water at high altitude. The atmospheric activity on the surface of the earth is very obvious and active, and it is easy to see the structure of many cyclones. In the summer of Taiwan, it is often attacked by tropical cyclones (typhoons).

Earth satellite

The Earth has a moon, a disproportionately large satellite with a radius of about one-fourth of the Earth. Although Jupiter and Saturn have larger satellites than the moon, they are nothing more than a small celestial body compared to the planet itself.

“The birth of the moon?”

The most powerful argument for the cause of the moon is the impact of the impact. The content is such that when the Earth was formed, a Martian-sized planet hit the Earth, causing some of the Earth’s earth to leave the Earth, about a month after the impact. Form the original moon. This also shows why the density of the moon is much lower than the Earth. There are many experiments using computer simulations in Japan, and the results of the simulation support this hypothesis. The picture on the left is the moon generation process presented by the Japanese simulation experiment.

The distance between the moon and the Earth is about 384,400 kilometers. It can be said that it is very close. The moon is observed on the earth. The brightness of the moon can reach -12.7, and its apparent diameter is about 0.5 degrees.

The moon is also the current (2007), another land that humans have set on except the earth.

The moon is large, which means that the lunar gravity has a strong effect on the earth’s tidal waves. At present, the moon and the earth are still not in balance, the moon will gradually move away from the earth, and the earth’s rotation will gradually slow down. The balance will not be reached until the time the moon orbits the earth is fifteen days a week and the earth rotates for fifty-five days a week.

Observation information

You should see the earth every day…><

HD big picture (source NASA)

Earth (click on the image to enlarge)

Earth (click on the image to enlarge)

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