Are there four seasons on Mars?

No, the primary school Chinese textbook 1 1 has an explanation. 1879, an Italian astronomer observed that the color of the surface of Mars changes with the seasons. Some people think this is because the plants on the surface of Mars change color with the seasons. 197 1 year, the United States launched the "Mercury 9" spacecraft into orbit around Mars. Took a lot of photos. It is found that the so-called four-season discoloration on Mars is not caused by the growth and withering of plants, but by the wind blowing away the dust on the surface of Mars, resulting in the change of color brightness.