1. じゅうりょく   universe   gravity   meteorite   orbit   Hint Half-n-half Clue   2. すいせい   astronomer   star   comet   telescope   Half-n-half Clue   3. いんせき   outer space   meteorite   satellite   light years   Half-n-half Clue   4. ぎんがけい   meteorite   galaxy   meteor   Earth   Half-n-half Clue   5. ほし   star   Sun   astronaut   telescope   Half-n-half Clue   6. ちきゅう   asteroid   universe   solar system   Earth   Half-n-half Clue   7. たいようけい   atmosphere   astronaut   galaxy   solar system   Half-n-half Clue