1. planète   planet   astronomer   meteor   star   Hint Half-n-half Clue   2. univers   meteor   universe   astronomer   solar system   Half-n-half Clue   3. astéroïde   astronomer   gravity   atmosphere   asteroid   Half-n-half Clue   4. étoile   gravity   atmosphere   telescope   star   Half-n-half Clue   5. soleil   planet   astronomer   atmosphere   Sun   Half-n-half Clue   6. astronaute   satellite   astronaut   meteorite   orbit   Half-n-half Clue   7. astronome   galaxy   outer space   solar system   astronomer   Half-n-half Clue