1. comète   universe   comet   atmosphere   gravity   Hint Half-n-half Clue   2. télescope   solar system   comet   telescope   planet   Half-n-half Clue   3. galaxie   astronaut   gravity   universe   galaxy   Half-n-half Clue   4. orbite   Earth   satellite   orbit   atmosphere   Half-n-half Clue   5. univers   moon   universe   planet   meteorite   Half-n-half Clue   6. espace intersidéral   light years   outer space   meteorite   gravity   Half-n-half Clue   7. astéroïde   light years   asteroid   orbit   Sun   Half-n-half Clue