1. meteora   meteor   meteorite   Earth   solar system   Hint Half-n-half Clue   2. gravità   planet   star   astronaut   gravity   Half-n-half Clue   3. meteorite   atmosphere   orbit   light years   meteorite   Half-n-half Clue   4. galassia   moon   telescope   galaxy   astronaut   Half-n-half Clue   5. Spazio cosmico   Earth   Sun   moon   outer space   Half-n-half Clue   6. cometa   atmosphere   meteorite   light years   comet   Half-n-half Clue   7. astronomo   astronomer   meteor   comet   asteroid   Half-n-half Clue