1. terre   Earth   universe   orbit   moon   Hint Half-n-half Clue   2. univers   moon   astronomer   comet   universe   Half-n-half Clue   3. galaxie   light years   star   comet   galaxy   Half-n-half Clue   4. lune   solar system   planet   moon   astronomer   Half-n-half Clue   5. années légères   light years   atmosphere   galaxy   planet   Half-n-half Clue   6. système solaire   asteroid   atmosphere   solar system   universe   Half-n-half Clue   7. météore   meteor   satellite   astronaut   galaxy   Half-n-half Clue