1. atmósfera   atmosphere   Earth   outer space   telescope   Hint Half-n-half Clue   2. galaxia   gravity   galaxy   astronaut   telescope   Half-n-half Clue   3. planeta   orbit   planet   telescope   atmosphere   Half-n-half Clue   4. astrónomo   Earth   astronomer   solar system   star   Half-n-half Clue   5. cometa   telescope   comet   satellite   star   Half-n-half Clue   6. gravedad   gravity   moon   galaxy   asteroid   Half-n-half Clue   7. sistema solar   Sun   gravity   solar system   meteor   Half-n-half Clue