1. gravità   light years   gravity   meteor   satellite   Hint Half-n-half Clue   2. astronomo   outer space   astronomer   orbit   Sun   Half-n-half Clue   3. cometa   comet   gravity   moon   light years   Half-n-half Clue   4. anni chiari   asteroid   galaxy   light years   astronaut   Half-n-half Clue   5. pianeta   moon   Sun   star   planet   Half-n-half Clue   6. atmosfera   astronaut   light years   solar system   atmosphere   Half-n-half Clue   7. astronauta   comet   satellite   astronaut   solar system   Half-n-half Clue