1. wai ceng [kong;kong] [jian;jian]   planet   outer space   meteor   telescope   Hint Half-n-half Clue   2. yun [dan;shi]   gravity   telescope   meteorite   astronaut   Half-n-half Clue   3. [di] qiu   star   Earth   universe   satellite   Half-n-half Clue   4. [xing;hang] xing   meteor   Earth   universe   planet   Half-n-half Clue   5. xing [xi;ji]   moon   telescope   satellite   galaxy   Half-n-half Clue   6. guang nian   outer space   orbit   planet   light years   Half-n-half Clue   7. wei xing   atmosphere   astronaut   comet   satellite   Half-n-half Clue