1. astronomo   astronomer   orbit   satellite   Sun   Hint Half-n-half Clue   2. sole   asteroid   Sun   planet   galaxy   Half-n-half Clue   3. gravità   light years   gravity   moon   astronomer   Half-n-half Clue   4. sistema solare   solar system   comet   astronaut   atmosphere   Half-n-half Clue   5. stella   star   atmosphere   moon   astronomer   Half-n-half Clue   6. telescopio   telescope   astronomer   galaxy   moon   Half-n-half Clue   7. meteorite   gravity   meteorite   Earth   atmosphere   Half-n-half Clue