1. hoshi   Earth   universe   star   planet   Hint Half-n-half Clue   2. uchuhikoushi   astronaut   outer space   solar system   star   Half-n-half Clue   3. gingakei   galaxy   comet   moon   star   Half-n-half Clue   4. chikyuu   planet   satellite   Earth   gravity   Half-n-half Clue   5. tenbungakusha   outer space   meteorite   star   astronomer   Half-n-half Clue   6. ryuusei   gravity   meteor   star   orbit   Half-n-half Clue   7. taiki   galaxy   atmosphere   planet   astronaut   Half-n-half Clue