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