1. Earth   astronomo   meteora   terra   galassia   Hint Half-n-half Clue   2. asteroid   satellite   meteora   asteroid   atmosfera   Half-n-half Clue   3. Sun   sole   sistema solare   cometa   astronauta   Half-n-half Clue   4. telescope   terra   telescopio   sistema solare   meteorite   Half-n-half Clue   5. galaxy   orbita   meteora   galassia   pianeta   Half-n-half Clue   6. gravity   astronauta   sistema solare   gravità   universo   Half-n-half Clue   7. planet   pianeta   meteorite   meteora   satellite   Half-n-half Clue