1. comet   sistema solare   cometa   meteora   orbita   Hint Half-n-half Clue   2. light years   anni chiari   atmosfera   meteorite   sistema solare   Half-n-half Clue   3. Sun   stella   sistema solare   galassia   sole   Half-n-half Clue   4. orbit   cometa   universo   orbita   meteorite   Half-n-half Clue   5. asteroid   sole   Spazio cosmico   asteroid   orbita   Half-n-half Clue   6. Earth   terra   stella   galassia   anni chiari   Half-n-half Clue   7. galaxy   terra   asteroid   satellite   galassia   Half-n-half Clue