1. système solaire   meteorite   gravity   solar system   meteor   Hint Half-n-half Clue   2. étoile   Earth   star   orbit   comet   Half-n-half Clue   3. atmosphère   asteroid   telescope   universe   atmosphere   Half-n-half Clue   4. satellite   astronomer   astronaut   satellite   moon   Half-n-half Clue   5. astronome   satellite   asteroid   outer space   astronomer   Half-n-half Clue   6. astéroïde   solar system   galaxy   light years   asteroid   Half-n-half Clue   7. comète   comet   moon   astronaut   star   Half-n-half Clue