China's first man-made satellite Dongfanghong 1 made China the ①country to send a satellite independently. Tiangong Program made it possible for scientists to ②so that more astronauts can live and do research in space. ③landed on the moon's dark side. Pictures and videos sent back by China's first Mars probe allowed us to see this ④ planet at such a close distance. Thanks to the achievements above, China is now one of the leading countries in space exploration.
