1. うちゅうひこうし   asteroid   outer space   astronaut   comet   Hint Half-n-half Clue   2. りゅうせい   satellite   Earth   orbit   meteor   Half-n-half Clue   3. きどう   satellite   galaxy   meteor   orbit   Half-n-half Clue   4. すいせい   universe   Earth   galaxy   comet   Half-n-half Clue   5. こうせい、わくせい   meteor   astronaut   satellite   planet   Half-n-half Clue   6. ぼうえんきょう   telescope   meteorite   satellite   gravity   Half-n-half Clue   7. えいせい   moon   galaxy   satellite   star   Half-n-half Clue