took part. translator: i hope one day i can fly with other international astronauts in space and welcome them to visit china s space station. reporter: but western astronauts will need to study up first, these interfaces are in chinese. and china reports their astronauts are already taking language courses to visit the chinese smpace station. china is rapidly catching up, it has returned samples from the moon and like the u.s. put a rover on mars, all within the last year. it s also got big plans for commercial ventures and for deep space exploration. including to build a base on the moon with russia. and send humans to mars in the 2030s. from launching billionaires to cosmic explorations, the u.s. is still leading with plenty of headline grabbing launches and