1. années légères   asteroid   light years   telescope   astronaut   Hint Half-n-half Clue   2. galaxie   galaxy   gravity   solar system   astronaut   Half-n-half Clue   3. astronome   planet   astronomer   orbit   solar system   Half-n-half Clue   4. météore   outer space   Earth   meteor   gravity   Half-n-half Clue   5. gravité   Earth   satellite   gravity   outer space   Half-n-half Clue   6. lune   outer space   galaxy   moon   gravity   Half-n-half Clue   7. planète   planet   comet   meteor   astronaut   Half-n-half Clue