1. astronaute   asteroid   astronaut   telescope   light years   Hint Half-n-half Clue   2. galaxie   atmosphere   galaxy   astronomer   astronaut   Half-n-half Clue   3. astronome   light years   orbit   astronomer   gravity   Half-n-half Clue   4. gravité   telescope   meteorite   gravity   solar system   Half-n-half Clue   5. lune   planet   astronomer   moon   light years   Half-n-half Clue   6. espace intersidéral   astronomer   Sun   comet   outer space   Half-n-half Clue   7. comète   atmosphere   meteor   solar system   comet   Half-n-half Clue