1. universo   orbit   universe   telescope   planet   Hint Half-n-half Clue   2. meteora   asteroid   gravity   Earth   meteor   Half-n-half Clue   3. gravità   gravity   atmosphere   star   light years   Half-n-half Clue   4. cometa   meteorite   universe   astronomer   comet   Half-n-half Clue   5. atmosfera   moon   atmosphere   light years   meteor   Half-n-half Clue   6. pianeta   moon   planet   meteor   asteroid   Half-n-half Clue   7. sistema solare   solar system   universe   light years   telescope   Half-n-half Clue