1. astronome   atmosphere   planet   astronomer   moon   Hint Half-n-half Clue   2. télescope   moon   Earth   telescope   Sun   Half-n-half Clue   3. satellite   galaxy   telescope   Sun   satellite   Half-n-half Clue   4. gravité   Sun   atmosphere   orbit   gravity   Half-n-half Clue   5. orbite   satellite   light years   gravity   orbit   Half-n-half Clue   6. espace intersidéral   meteorite   outer space   universe   light years   Half-n-half Clue   7. planète   planet   atmosphere   satellite   meteor   Half-n-half Clue