1. terre   telescope   astronomer   Earth   star   Hint Half-n-half Clue   2. atmosphère   solar system   gravity   telescope   atmosphere   Half-n-half Clue   3. système solaire   planet   light years   solar system   asteroid   Half-n-half Clue   4. orbite   astronaut   solar system   orbit   astronomer   Half-n-half Clue   5. météore   astronomer   universe   meteor   Earth   Half-n-half Clue   6. espace intersidéral   moon   satellite   outer space   planet   Half-n-half Clue   7. galaxie   galaxy   solar system   outer space   asteroid   Half-n-half Clue