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2???????

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??????????????(??????) ????????????:??