1. atmosphère   astronaut   Earth   Sun   atmosphere   Hint Half-n-half Clue   2. météorite   meteorite   light years   gravity   orbit   Half-n-half Clue   3. soleil   astronomer   Sun   orbit   satellite   Half-n-half Clue   4. système solaire   astronomer   meteor   solar system   Sun   Half-n-half Clue   5. étoile   Earth   meteor   outer space   star   Half-n-half Clue   6. astronome   telescope   astronomer   star   planet   Half-n-half Clue   7. télescope   telescope   solar system   meteorite   galaxy   Half-n-half Clue