1. [di] qiu   light years   Earth   moon   star   Hint Half-n-half Clue   2. yu hang [yuan]   astronomer   Sun   universe   astronaut   Half-n-half Clue   3. [xing;hang] xing   outer space   planet   asteroid   atmosphere   Half-n-half Clue   4. xing   star   gravity   outer space   orbit   Half-n-half Clue   5. wei xing   universe   meteor   comet   satellite   Half-n-half Clue   6. wang yuan jing   star   orbit   telescope   light years   Half-n-half Clue   7. yu zhou   star   Earth   universe   meteorite   Half-n-half Clue