1. planet   [xing;hang] xing   yun [dan;shi]   wang yuan jing   tian wen xue [jia]   Hint Half-n-half Clue   2. astronomer   guang nian   wang yuan jing   tian wen xue [jia]   [xing;hang] xing   Half-n-half Clue   3. star   wai ceng [kong;kong] [jian;jian]   xing   wei xing   [di] qiu   Half-n-half Clue   4. moon   yu hang [yuan]   yue liang   gui dao   wang yuan jing   Half-n-half Clue   5. atmosphere   [di] qiu   fei xing   tian wen xue [jia]   [da;dai] qi   Half-n-half Clue   6. universe   yu zhou   wang yuan jing   fei xing   wai ceng [kong;kong] [jian;jian]   Half-n-half Clue   7. gravity   tai yang [xi;ji]   [zhong;chong] li   [xing;hang] xing   wei xing   Half-n-half Clue