1. orbit   wai ceng [kong;kong] [jian;jian]   gui dao   yun [dan;shi]   [zhong;chong] li   Hint Half-n-half Clue   2. comet   [xing;hang] xing   wai ceng [kong;kong] [jian;jian]   hui xing   [di] qiu   Half-n-half Clue   3. star   fei xing   yue liang   xing   yun [dan;shi]   Half-n-half Clue   4. galaxy   xing [xi;ji]   xiao [xing;hang] xing   tai yang [xi;ji]   guang nian   Half-n-half Clue   5. gravity   xing [xi;ji]   guang nian   yu zhou   [zhong;chong] li   Half-n-half Clue   6. astronaut   wai ceng [kong;kong] [jian;jian]   yu hang [yuan]   tian wen xue [jia]   [xing;hang] xing   Half-n-half Clue   7. outer space   xing   wai ceng [kong;kong] [jian;jian]   hui xing   [zhong;chong] li   Half-n-half Clue