1. wei xing   satellite   gravity   outer space   astronomer   Hint Half-n-half Clue   2. tian wen xue [jia]   light years   star   comet   astronomer   Half-n-half Clue   3. yu hang [yuan]   astronaut   universe   outer space   gravity   Half-n-half Clue   4. tai yang [xi;ji]   galaxy   orbit   Sun   solar system   Half-n-half Clue   5. [da;dai] qi   astronomer   moon   atmosphere   satellite   Half-n-half Clue   6. fei xing   meteor   galaxy   astronomer   star   Half-n-half Clue   7. yun [dan;shi]   planet   meteorite   outer space   satellite   Half-n-half Clue