1. luna   planet   moon   light years   meteor   Hint Half-n-half Clue   2. Tierra   astronaut   astronomer   Earth   Sun   Half-n-half Clue   3. años luz   planet   light years   outer space   astronomer   Half-n-half Clue   4. astronauta   outer space   astronaut   moon   solar system   Half-n-half Clue   5. universo   telescope   Earth   galaxy   universe   Half-n-half Clue   6. órbita   orbit   planet   satellite   gravity   Half-n-half Clue   7. cometa   universe   outer space   astronomer   comet   Half-n-half Clue