Students of Zhuhelu Primary School take part in the theme activity of "knowing space knowledge, igniting space dream" in Hanshan District of Handan, north China's Hebei Province, April 24, 2019. Since 2016, China has set April 24 as the country's Space Day. The various activities on Space Day have become a window for the Chinese public and the world to get a better understanding of China's aerospace progress. (Xinhua/Wang Hongchao)