1. astéroïde   atmosphere   asteroid   Earth   Sun   Hint Half-n-half Clue   2. terre   Earth   gravity   light years   astronomer   Half-n-half Clue   3. gravité   meteorite   meteor   gravity   Sun   Half-n-half Clue   4. astronome   meteorite   light years   telescope   astronomer   Half-n-half Clue   5. galaxie   galaxy   meteor   gravity   universe   Half-n-half Clue   6. univers   satellite   planet   universe   Sun   Half-n-half Clue   7. orbite   planet   meteor   orbit   satellite   Half-n-half Clue