For thousands of years，lack of sufficientdataresultsin the fact that space is still a mystery to us. Mankind keeps an ongoingdesire for space exploration， hoping to figureout how stars and planets operate， although some people argue that we should stop wasting money on it， which is a rather shallow belief. Intelligent people have always attached great importance to universe exploration inthehopeof discovering more resources， which on earth are limited and runningout.
Decades ago， many scientists were determined to make space flight come true with special vehicles. With the first satellitelaunched and orbiting around Earth successfully， Yuri Gagarin became the first astronaut to be sent into space. After that， Neil Armstrong succeeded in stepping onto the moon，signaling a giantleap for mankind. Despite some disappointing failures， human beings are still keen to carryon exploring universe soasto learn its secrets.
After sending humans into space independently in 2003， China has made great progress beyond expectations — Tiangong 2 docked with Tianzhou 1， Chang’e 4 landed on the moon， and so on.
