The solar system is the eight planets

The solar system is the eight planets

Today, I heard that the children are saying that there are eight planets in the solar system. I just know that Pluto has been delisted. It’s really a good knowledge, and it is the children taught me.

The Earth is the third planet of the solar system. According to the distance from the Sun, it is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Pluto is the ninth planet of the solar system, but on August 24, 2006, the International Astronomical Union will classify it as a dwarf planet, no longer a planet, so the solar system is the eight planets, not the nine planets.

Elementary schools and middle schools and high schools all teach a part of the earth science and teach some common sense. I used his textbooks to find that many of the contents are different from what I have learned and changed a lot.

Earth Science:
Earth science refers to the study of the earth, including physics, geography, astronomy, statistics, chemistry, biology, minerals, etc., to study the earth's various knowledge from various angles.

such as:
The earth is not a flat land, but a circle that is similar to a circle. The person below the ball does not fall out is because the gravity of earth.

The density of the earth is the highest among the eight planets.
The earth rotates , so it produces day and night and four seasons.
There is only one satellite in the earth, the moon.
The surface of the earth is 71% water and the outside is the atmosphere.
The earth was about 4.54 billion years old, and when it was 340 million years old, it began to form the ocean. At 10.4 billion years old, life appeared in the ocean.
There are nearly 8 billion people on the planet and nearly 200 countries and regions.

So earth science is a very large study, and it is always being revised.

太陽系是八大行星

今天聽到小孩子在說，太陽系有八大行星，我才知道冥王星被除名了，真是漲見識了，還是小孩子教我的。

地球是太陽系的第三行星，按照距離太陽的遠近，依序為水星、金星、地球、火星、木星、土星、天王星、海王星。
冥王星本為太陽系的第九行星，但在2006年8月24日，國際天文聯會將其劃為矮行星，不再是行星，所以太陽系是八大行星，而不是九大行星了。

小學和國中和高中，都有教導一部分的地球科學，教導一些比較普遍的常識，我拿他的課本來看，發現很多的內容，都和我所學的不同了，改了很多。

地球科學:
地球科學是指研究地球的學問，包含了物理、地理、天文、統計學、化學、生物、礦物等等，以各種角度來研究地球的種種學問。

比如:
地球不是平的大地，而是近似於圓形，在圓球的下面的人，之所以不會掉下去，是因為地心引力。

地球的密度是八大行星之中最高的。
地球同時自轉和公轉，所以產生了晝夜和四季。
地球僅有一顆衛星，即月球。
地球的表面，71%為水，外部為大氣層。
地球約45.4億歲，3.4億歲的時候開始形成海洋，在10.4億歲的時候出現了生命於海洋之中。
地球上的人口約有近80億，國家和地區有近200個。

所以地球科學是門很龐大的學問，且隨時在修正之中。