1. [zhong;chong] li   meteor   telescope   gravity   Earth   Hint Half-n-half Clue   2. wai ceng [kong;kong] [jian;jian]   meteor   Sun   light years   outer space   Half-n-half Clue   3. [di] qiu   Earth   moon   asteroid   galaxy   Half-n-half Clue   4. gui dao   orbit   astronaut   astronomer   meteorite   Half-n-half Clue   5. yun [dan;shi]   solar system   astronaut   meteorite   atmosphere   Half-n-half Clue   6. hui xing   meteor   comet   meteorite   asteroid   Half-n-half Clue   7. [da;dai] qi   galaxy   astronaut   atmosphere   meteorite   Half-n-half Clue