????:1??????:????

2?????200?????

3??????

4??????????

5????????

????6????18???? ????????????(NASA)???18???????,??“?????”?26???????????????

“??????”?,NASA18???????????,??????,????25???22?10?????????,???????4????51??????

??????????,NASA?????18?????????,???????????????????,????,???????????,“?”???45????????

5????????,“????”?????????????????????“??????5”??????????,?????????????????????,?????????,“????????????????”??????,“??”28??????????????5??????????

???????????2011???,???????????????????????(SpaceX)2014?NASA?,?????????????“?”??????“????”??,NASA?????

??,????2017???????,????????????????????,“?”?????????????;????“?”??????????,????????????????10????????????(??????????) ??:??????????????