1. orbit   wei xing   tai yang [xi;ji]   gui dao   xing   Hint Half-n-half Clue   2. light years   fei xing   [da;dai] qi   guang nian   wai ceng [kong;kong] [jian;jian]   Half-n-half Clue   3. satellite   wei xing   [di] qiu   yue liang   yu hang [yuan]   Half-n-half Clue   4. galaxy   xing [xi;ji]   xiao [xing;hang] xing   tian wen xue [jia]   yu hang [yuan]   Half-n-half Clue   5. gravity   yun [dan;shi]   wai ceng [kong;kong] [jian;jian]   [zhong;chong] li   fei xing   Half-n-half Clue   6. telescope   [zhong;chong] li   hui xing   tai yang   wang yuan jing   Half-n-half Clue   7. outer space   tai yang   fei xing   wai ceng [kong;kong] [jian;jian]   [da;dai] qi   Half-n-half Clue