The name "earth" comes from the word "earth" in old English. When people don't know that the earth is a planet, the word "earth" only refers to the land where people walk. Later, the word not only refers to the earth under our feet, but also gradually refers to the whole world itself. As for when the word appeared, there is no way to verify it. The earth is one of the eight planets in the solar system, with the international name "Gaia", ranking third in the order from near to far from the sun. It has a natural satellite-the moon, forming a celestial system-the earth-moon system.
Earth position map
1. The planet where human beings live is one of the eight planets in the solar system. Its average distance from the sun is149.6 million kilometers, ranking third among the planets. Its equatorial radius is 6378.2 kilometers, ranking fifth among the planets in size.
2. It refers to the whole world: if teenagers are better than the earth, then the country is better than the earth.