1. atmosfera   Sun   asteroid   orbit   atmosphere   Hint Half-n-half Clue   2. galassia   satellite   moon   galaxy   telescope   Half-n-half Clue   3. meteorite   satellite   meteorite   light years   telescope   Half-n-half Clue   4. gravità   star   gravity   Sun   astronomer   Half-n-half Clue   5. terra   satellite   star   Earth   universe   Half-n-half Clue   6. anni chiari   light years   gravity   moon   orbit   Half-n-half Clue   7. pianeta   astronomer   comet   orbit   planet   Half-n-half Clue