1. [zhong;chong] li   gravity   Sun   asteroid   outer space   Hint Half-n-half Clue   2. guang nian   atmosphere   Earth   light years   asteroid   Half-n-half Clue   3. wang yuan jing   star   telescope   solar system   satellite   Half-n-half Clue   4. fei xing   meteor   moon   atmosphere   meteorite   Half-n-half Clue   5. gui dao   outer space   orbit   meteorite   gravity   Half-n-half Clue   6. hui xing   planet   outer space   comet   Earth   Half-n-half Clue   7. xing   meteor   moon   star   meteorite   Half-n-half Clue